Bush and Obama aren't all that different, to be honest.
Both supported Amnesty, the bailouts. Bush was feeding the companies $ to keep them afloat, and so did Obama.
Yes, Obama pushed healthcare thru, but Bush tried to privatize social security, which *(looking at the banks crashes of 2008) would have left tens of millions of seniors penniless.
So really, I don't think whoever wins in 2012 or 2016 will be all that different, unless it's a Ron Paul. A guy like Romney or Newt would just do what Obama and Bush did. Sure, they all bash each other, but Obama is a ton like Bush.