Some progressives are celebrating this choice, figuring that Ryan's ultra-conservative fiscal policy will alienate a lot of voters. That's the good news.
The bad news: This choice will, at the same time, fire up the conservative base, including the Tea Party. And they vote. And they could win.
A Romney-Ryan win could devastate this nation, especially if the GOP retains control of the House.
So is this enough to motivate the disillusioned left?