a voter who has no allegiance to any political party and whose unpredictable decisions can swing the outcome of an election one way or the other
But the idea of the swing voter is way oversold by the media.
The electorate is well aware of this--my mother, aka "The swing voter", is voting for Obama, but only with extreme reluctance.
Well, actually, I'm not really a swing voter, and I live in the District of Columbia, so it wouldn't matter even if I were.
My mother, aka The swing voter, delivered an extensive rant on the subject of Mitt Romney's taxes this morning.