A good reason to waste your gas would be to vote for a Republican you might not care for, because if such a Republican got elected , he would keep a Democrat out of the White House.
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You might elect a Democrat who registered Republican like Lindsey Graham, Nikki Haley, or John McCain.
Well, if the Republican nominee in a general election is not a strong conservative, the problem is that strong conservatives have not won primary elections to be the GOP nominee in the general election.