This model is moving in Braley's direction, which is beyond stupid.
Braley has completely bombed his campaign and he is still even with Ernst. Now that he is hitting back against the Republican, it wouldn't at all be a surprise to see a small lead open up. I've never bought into the idea that Iowa was easy picking for the GOP. Can Ernst win? Absolutely. But it is really problematic that she can't even take a lead against a pretty weak opponent.
In a few months we'll add Iowa 2014 to the list of winnable Senate races Republicans blew by nominating an embarrassingly terrible candidate. Unfortunately that may be the only one this time.