Despite my extreme dislike and distrust of politicians, I still vote. I know it probably doesn't mean anything, but I always try to vote a third party, or at least for a candidate that somewhat sits well at my conscience. Even though in the back of my brain, I think that most politicians are scumbags, and anyone wanting power probably shouldn't have it.
It's a weird juxtaposition to be in. I've fantasized about a law getting passed where, if enough percentage of the population doesn't vote or casts a vote of no confidence, then the entire election process is redone with new candidates. That way, not voting would be much more of a protest than it currently is. But I don't think that's going to happen in America.
I do vote on local laws, though, because those affect me much more directly.