In case the video goes away, Romney warns “If we re-elect Barack Obama, Iran will get a nuclear weapon,” he said. “If we elect Mitt Romney, Iran will not.” We need some way to rein in the blatantly untrue claims like this one, and demanding promises for consequences may be one way to do that.
After having run for office myself, I still can't get over how much worse the quality of rhetoric and campaigning is at the state and national level. On my campaign website I described what I supported but said "I will be just one of seven Board members, so making [my issues] happen will need some help, but public support and public involvement can help push through changes...." I believe it would've cost me politically if I made promises I couldn't guarantee, like Romney's doing. Journalists ought to hold him accountable, or at least get a flustered response out of him.
Just to imitate the journalistic practice of false balance, here's a nice thing to say about a former Republican candidate, Rick Perry: he was right about instituting Supreme Court term limits (via New Yorker with some helpful elaboration). I've supported this before, I think a lot of my fellow lawyers would do the same, and I see no reason for Democrats not to do the same.