Scandal is unfolding around New Jersey Gov. Chris Christie over lane closures on the George Washington Bridge as part of a political vendetta to punish a local mayor who wouldn't support him at the polls.In damaging evidence, Christie's top aide, Bridget Anne Kelly, sent an e-mail to David Wildstein, then-top New Jersey official at the Port Authority, three weeks before the lane closures, saying, "Time for some traffic problems in Fort Lee.""Got it," Wildstein replied.New Jersey State Sen. Ray Lesniak told CNN he will formally request an investigation. 
Sen. Robert Menendez is saying accusations of paying a Dominican woman for sex against him are part of a smear campaign against him after a woman filed a notarized statement that she had never even met the New York Democrat. If Menendez's charges are true, it wouldn't be the first time an American politician was targeted for dirty tricks -- the practice goes back as far as running for office in the U.S.Click through to see other examples of less-than-ethical campaign tactics. 
Fake letters: Then-Sen. Edmund Muskie of Maine was expected to do well in the 1972 Democratic primary in neighboring New Hampshire. But the Manchester Union-Leader published a letter alleging that Muskie condoned the use of the term "Canuck," a derogatory term used against French-Canadians. Muskie denied the charge but still suffered at the polls in the early primary, which doomed his chances. The Washington Post later reported that the letter was a hoax and was probably written by Ken Clawson, deputy White House communications director in the Nixon administration. 
Watergate: The break-in at the Watergate was just the tip of the iceberg of what was going on within Richard Nixon's re-election campaign in 1972. The Nixon machine was hell-bent on destroying its opponents and Donald Segretti was one of the primary dirty tricksters. The Nixon operative printed fliers that attacked Muskie on his stance against Israel and placed them outside synagogues. He also pitted Democrats against one another in a tactic he called "rat-f---ing," like the letter addressed from Citizens for Muskie that accused Democratic primary rival Sen. Henry Jackson of fathering an illegitimate child with a teenager and that Jackson was a homosexual. Segretti was one of several Nixon operatives who ended up in jail. 
Doctored photos: Ross Perot was the first major third-person candidate in modern American politics to mount a serious run for the White House. His plain spokenness got attention and his platform appealed to the far-right. Most of all, he was seen as a threat to split the Republican vote with President George H.W. Bush, who was running for his second. Despite the energy in his campaign, Perot dropped out of the race, claiming that Republican operatives were about to smear his daughter with doctored photos and try to ruin her wedding. Perot never explained what the photograph purportedly showed. 
South Carolina: Sen. John McCain's first run for president was against then-Texas Gov. George W. Bush in 2000. Karl Rove, often called the "brain" behind the Bush operation, began to spread the rumor in South Carolina that McCain had fathered an illegitimate black child, asking voters if they would support McCain if he had fathered an illegitimate black child. McCain lost South Carolina decisively and his chance at the nomination. The rumors twisted the fact that McCain's adopted daughter Bridget whom he adopted from Bangladesh. 
The mystery of Alvin Greene: When Alvin Greene suddenly won the Democratic primary for U.S. Senate in South Carolina, experts asked, "Who?" Greene didn't campaign, had no political experience was rarely seen in public. A CNN interview led to more questions of whether he was intellectually capable of running a viable campaign. Others felt that Green was planted by Republican Sen. Jim DeMint, who was running for re-election. Greene was cleared by the South Carolina Law Enforcement Division before he lost overwhelmingly to DeMint. 
Swift-boating: Before John Kerry was elected senator, won the Purple Heart and a Bronze Star for his service in Vietnam before later protesting against the war. When he ran against Bush in 2004, he spoke out against the Iraq War. Although Kerry was seen as the underdog in the race, he was gaining momentum before a political ad released by the group known as Swift Boat Veterans for Truth accused Kerry of speaking ill of his fellow veterans and lying to get his medals. Kerry first tried to ignore the ads before denying the allegations but by then the ads and Kerry's avoiding them stopped whatever momentum was building. - Christie and his family starred in ads for New Jersey tourism after Sandy
- New Jersey Democratic Rep. Pallone said he was concerned about bidding process
- Winning bid was $2 million more than others and included Christie family
- Christie fired two aides last week over the George Washington Bridge scandal
Washington (CNN) -- Just days after dismissing two top advisers for their roles in the George Washington Bridge scandal, New Jersey Gov. Chris Christie is facing questions over the use of Superstorm Sandy relief funds.
CNN has learned that federal officials are investigating whether Christie improperly used those relief funds to produce tourism ads that starred him and his family.
The news couldn't come at a worse time for the scandal-plagued Republican, who is facing two probes into whether his staff tied up traffic near the country's busiest bridge to punish a Democratic mayor who refused to endorse his successful re-election bid.
N.J. Democratic legislator: 'I do believe laws have been broken'
Implications of Christie bridge scandal 
Bridge scandal investigator speaks out 
Fmr. Gov. Richardson on Bridge Scandal If the Sandy inquiry finds any wrongdoing, it could prove even more damaging to Christie's national ambitions. His performance during and after the superstorm has been widely praised and is a fundamental part of his straight-shooting political brand.
In the new probe, federal auditors will examine New Jersey's use of $25 million in Sandy relief funds for a marketing campaign to promote tourism at the Jersey Shore after Sandy decimated the state's coastline in late 2012, New Jersey Democratic Rep. Frank Pallone told CNN
In an August letter, Pallone asked the Department of Housing and Urban Development inspector general to look into how Christie chose to spend the marketing money approved by the department.
Neither the governor's office nor the inspector general's office has replied to CNN's request for comment on the investigation.
Pallone wrote that he was concerned about the bidding process for the firm awarded the marketing plan; the winning firm is charging the state about $2 million more than the next lowest bidder. The winning $4.7 million bid featured Christie and his family in the advertisements while the losing $2.5 million proposal did not feature the Christies.
On Sunday, Pallone told CNN that the inspector general conducted a preliminary review of the spending and concluded that there was enough evidence to launch a full-scale investigation into the state's use of federal funds. The audit will take several months, and the findings will be issued in an official report, he said.
Pallone, a 27-year veteran of the House and vocal Christie critic, said this is not about politics.
"This was money that could have directly been used for Sandy recovery. And, as you know, many of my constituents still haven't gotten the money that is owed them to rebuild their homes or raise their homes or to help," he told CNN.
Legal concerns for Gov. Christie 
Christie's media moment 
McCain: Christie can move past scandal Legal woes lurk for Christie over bridge traffic jam
Democrats slammed Christie over the summer for starring in taxpayer-funded ads as he was running for re-election in November, arguing it gave him an unfair advantage. Christie aides said at the time that the winning bid provided more value.
Last week, Christie dismissed two top aides for their involvement in closing down access lanes to the George Washington Bridge last year, a move that tied up traffic for four days. A New Jersey State Assembly committee is investigating whether the aides ordered the lane closures as political retribution, and the U.S. Attorney in New Jersey has opened a probe into the matter.
For his part, Christie has said he didn't know about the scheme and was "embarrassed and humiliated" by it. Democrats, both in New Jersey and nationally, have jumped on the scandal, saying it finally gives the nation an opportunity to see what they've known for years, that Christie is a bully who governs by fear.
But as bad as the bridge scandal is for Christie, if investigators find he improperly spent Sandy funds, it could get far worse, tarnishing the signature achievement that has made him a serious contender for the White House.
CNN's Scott Bronstein contributed to this report.
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