Bob Perry recently donated $400,000 to Club for Growth, a group with a reputation for producing misleading attack ads. The group is now using Perry's contribution to produce ads against Democratic Senate Candidate Mark Udall. TPM speculates that these attack ads may be Republican candidate Schaffer's only hope:

Schaffer will be relying on wealthy funders like Perry to be funding, via Club for Growth, attack ad campaigns that just might enable him to hang on to his seat despite the scandals engulfing him.

But this isn't Perry's first foray into funding deceptive ads:

In 2006, Perry became the primary financier of the Free Enterprise Fund, a 527 heavily criticized for producing an attack ad suggesting Senator Menendez had mob connections. Perry also had a habit of putting the home telephone numbers of Democratic Candidates in his TV attack spots.

In 2004, Perry was the primary financier of Swift Boat Veterans for Truth, a smear campaign devoted to undermining Democratic Presidential Nominee John Kerry.

In 2001 and 2002, Perry was the largest contributor to DeLay's PACs, giving $165,000 in 2002 and $95,000 in 2001. DeLay was later indicted for conspiracy charges in 2005.

Read more about Perry's efforts here and here.