No vote is a wasted vote. Just because the candidate you support and vote for doesn’t win, doesn’t mean your vote was wasted. It just mean the majority doesn’t agree with you.
Regarding taxes, Obama is the candidate that’s the furthest from a flat tax policy. Personally, I would rather they have no income tax at all and just increase sales tax, property tax, etc. to compensate for the lost tax revenue. Lets tax the spender instead of the savers.