Take the issue of austerity. Yeah, Republicans want a savage austerity package that should be expected to collapse our economy like was done in Europe. But could they do that effectively like Obama can if he chooses to? Obama himself picked the heads of his Deficit Commission which is proposing a harmful austerity package.
In health care we need single payer. The deficit would be gone. 40-50 million people get some respectable options. It's win-win. Well sort of. It's not a win for profit seeking owners that will no longer make millions doing nothing. So they oppose it. The right wing Heritage Foundation crafted a plan that placates the masses but keeps the owners in the profit stream. Obama had a chance at bringing single payer, but instead he gave corporations their profitable solution, and the result will be continued high prices. It's not terribly surprising that Romney is now expressing support for some portions of Obama Care. It's a right wing plan.
Then of course you have all this war expansion and surveillance state expansion. All of this has come about virtually without opposition from the left. The argument is that while Romney is evil Obama is the more effective evil. It's a strong argument. I can respect that good people may come down on either side of this debate. This is a very hard question.