Come now, that's a 1st grade type accusation.
A) running for President is going to impede one's attendance in Congress - and if she, the most conservative candidate, is elected it would be an historic windfall for conservatism, so it is well worth her effort to help the Republican party by running for President.
B) if a vote is 1) important and 2) going to be close - those are the votes she gets back to Washington for. Duh. If a vote is passing or failing by dozens or hundreds of votes only an idiot would leave their campaign efforts to go back and vote.
This is the kind of misinformation that has people voting for Newt Romney.
Once you start running for President...you aren’t IN Congress. Roll Call, is a rather liberal entity, has complained about both her and Ron Paul on this. They never complained about Obama missing far more than the 54% of votes they admit to his missing after running for President. And the frauds of the Daily Kos I don’t think we need to dwell on.