For what it is worth, I think you may also be getting some overlap with collage sports. "Bama" in that context refers to the University of Alabama with "GoBama" and "NoBama" possibly being from fans and rivals respectively.

Not to say that either doesn't deserve pitchfork wielding mobs...

And now it just doesn't make sense at all:

We found 1140 results for "Obama" and an additional 6 that contained "Romney"" - likely because Obama's been president for four years.