One of the slimier ads, and to this partisan's nose it smells of desperation.
However, it's probably a pretty smart tactical move. Save your most obnoxious ad for the very last minute, so by the time the media has had time to point out how sleazy it is and how much money the Republicans have spent on running it, the election is already over.
They should have gone after this six months ago, but since they didn't, running it in an enormous one-day media blitz the day before the election was the second best strategy.
Of course, the best strategy of all would be to just run a candidate who is consistent, smart, level-headed and provides thoughtful solutions to today's problems. Way too late for that, though.