Vote! It's your duty and responsibility as a citizen in the U.S., and a right you have as a member of the community. People die for the chance to do this in some places, sometimes literally; don't take it for granted.
Besides, it preserves your right to bitch. If you don't vote, you have lost the right to complain about the state of government, in my eyes. At least go through the process, submit a blank ballot if need be (because you don't like anyone). That's a statement unto itself: "And the leading vote-getter is...blank".
C'mon, you only do it twice every 2 years, what's so freakin' hard about that?
(Afterthought: it would be harder for our deployed service members, and I thank them for their service.)