Sitting out the election?

I’ve talked to quite a few people who say they are planning to just sit out this election.  They refuse to vote for Obama, but they don’t like Romney, whether because he’s a Mormon or no true conservative or a tone-deaf bumbler or the same old politician or whatever.

The ones I’ve talked to generally vote Republican, so if there are many such folks who are refusing to vote, that could make a big difference in a close election.

Are any of you leaning in that direction?

Is not voting for Romney a vote for Obama?  And if so, why not just vote for Obama?  (If I did that, I would be accepted back into the bosom of my family, I would put the shades of my Democratic ancestors to rest, and I would eliminate the pang of unjustified guilt I always feel when I vote Republican.)