In January as Sen. Scott Brown (R-Mass.) negotiated with his Democratic opponent Elizabeth Warren over the details of a “People’s Pledge” to keep outside spending out of the Massachusetts senate race he stated:

“Attack ads from unaccountable outside groups that spend millions of dollars from anonymous donors portraying their opposition unfairly and misleading voters are wrong” — letter to Elizabeth Warren re: People’s Pledge.

Talking about her retirement to Businessweek in June, Sen. Olympia Snowe (R-Maine) said of the Supreme Court’s Citizens United decision:

Sen. John McCain (R-Ariz.) will not support transparency legislation that will be voted on next week in the U.S. Senate, a move at odds with months of interviews and actions by Arizona's senior Senator decrying the dismemberment of our campaign finance system.

A few recent examples: