Undecideds
Ok, let's pretend the Election is a big wild ass house party, like at the end of Weird Science, and instead of casting votes we're really all just trying to get laid.
Some people show up to the party with a date, so they already know who they're going home with -- in fact these people could've just skipped the party completely and stayed home with thighs covering their ears.
There are others who show up without knowing exactly who they want to nail, but they've got a type. Maybe they've got yellow fever and they go for Asians or Gaysians , or maybe love ass. Maybe they go gooey for bangs and big sunglasses, or hairy chests and ironic beards. Whatever; the point is they know what they like, and when they see it they all over it like gravy on a biscuit.
Some people don't have a type, they like to keep their options real wide. Let's say they're pansexual, and everyone at the party is looking good. This is a blessing and a curse, because they see a little sumthin-sumthin worth trying in just about everyone at the party. But let's say these happy, adventurous people are also pragmatic, and around midnight when the pickins are at risk of thinning out, they'll do a couple shots of tequila and hop on the next sweet thing that doesn't move faster than they do. If it doesn't end up working out, worst case scenario is they come back (in 4 years) and try for someone new and friskier.
But then there are people who can't make up their fucking minds. Maybe they're like our pansexuals -- except instead of everyone at the party looking Hot, to them everyone is looking really, really Not. The party would be a lot more fun for these people if they'd drink some of that tequila. Their options would certainly start looking better. Or maybe the problem is -- like the dummies on bad dating reality shows are always saying -- these people are waiting for what they think of as "the complete package." And wouldn't that be nice? But while they're waiting for that complete package to materialize, time's awasting and soon the party will be over.
These people who stand around while everyone else is hooking up around them are the Electoral Undecideds. But the problem is, unlike in the party metaphor, when they don't make the right decision everyone gets fucked.