In Barack Obama's first general election ad he claimed that passed laws that... "extended healthcare for wounded troops that had been neglected." (Public Law 110-181)
But, in reality... he didn't even show up to vote on the bill.
And, there's this, in another ad, he claims that he's a champion of welfare reform, but at the time....
Obama said this about the welfare reform legislation at this time:
"I am not a defender of the status quo with respect to welfare. Having said that, I probably would not have supported the federal legislation, because I think it had some problems."