Obama missed the vote on the Kyl-Lieberman amendment, which declared the Iranian Revolutionary Guard a terrorist group, and McCain is hammering him on it.

If he had voted against it, I don’t think that it would be a big deal, but he missed the vote, and he has done so on a number of other contentious votes, the MoveOn resolution comes to mind.

If McCain hammers him on the substance, that he opposed the resolution, it shouldn’t be a difficulty, as Obama spokesperson Hari Sevugan response shows, “Instead of recognizing reality, John McCain continues to run on a platform of doubling down on George Bush’s failed policies.”

However, if McCain starts harping on the contentious votes where he did not show up, and makes his attendance an issue, it is a problem, because it strikes at the core message of any presidential candidate, that he will stand up for you.

So far, so good, but I expect this worm to turn shortly.