You can't make the case that "Romney is better than Obama" if you judge him solely on his record, which is indistinguishable from any liberal Democrat's.
Vote for that snake oil salesman if you must, but just know that he will become the de facto leader of the Republican party, and a Republican dominated Congress will not oppose his liberal agenda with anywhere near the force that they'd lock arms in opposition against Obama.
In fact, if history is any guide (GWB), the Congress will roll over for him like a puppy.
Take a good hard look at those dynamics and ask yourself which scenario is preferable.
I'm judging Obama's record.
Who are you voting for?