Grabbed this from a post over at Pgh craigslist, Your Vote Counts. Hopefully, for those confused by the previous post about why voting sucks, this will elaborate. Some choice excerpts:

Your vote counts. Even if you ultimately voted for the losing candidate, you certainly approved the process by which his opponent was chosen. In a race as supposedly close as this, it bears repeating that the candidate you voted for might have won. It’s just too close to call. If you say that your candidate wouldn’t have done the particular things that the winner ends up doing, can you also say with certainty that he wouldn’t have done other similar things? Maybe we wouldn’t have gone to war with this country, maybe we would have bombed that country instead. Different dead people. Different burned children. Different destroyed lives. But in principle, no difference, really.

… you participated in the selection process. You agreed, implicitly, to abide the result. You consented to authorize the winner to exercise his power on your behalf. Even if you disagreed with how you expected him to act. In the same manner as voting for the “major” losing candidate, you cannot wash your hands of it and deny your responsibilities. When you give your consent to a process, you give your consent to the result. Accept this, you are responsible.