We will start with Obama Girl, "I've Got a Crush on Obama":

Hillary Girl:

Then we have Obama Girl vs. Giuliani Girl:

Here's will.i.am's "Yes We Can":

The best parody of "Yes We Can" attacking McCain (this is a masterpiece):

The McCain Girls (a parody):

The McCain Girl (singular, looks like Ann Coulter) (not really a song):

"Please Don't Vote for a Democrat":

Mike Gravel's Obama Girl collaboration:

The Obama Reggaeton Anthem (thanks, Matt):

Ludacris' "Obama is Here":

Obama Mariachi song, "Viva Obama":

And just to shake it up, here's my favorite anti-Sarkozy song from the 2006 Sarkozy-Royal match-up: