A vote is how you say, "I want this guy to win. If he does, we all accept him."
And if the other guy wins?
"And I'll accept the other guy if he wins. I accept this system of government. I support this form of government. I will obey this government because I agreed to follow what the majority chooses by voting."
That's what a vote says. Vote iff you support this form of government, because a vote is your signature on the social contract. If you want a dictatorship, monarchy, or something else then don't sign the contract accepting a democracy.