This I didn't know:
Hedgecoth estimates 15 percent of the people walking into and volunteering at the Linn County for Obama office are Republicans or former Republicans. Electing someone who can represent and find support on both sides of the political spectrum, he said, should go a long way to ending "the political gridlock" of recent years.
The campaign is hoping outspoken people like Blix, combined with Obama's third-place finish in a poll of Republican caucus-goers, will convince Iowans that electability isn't an issue for Obama.
I hadn't heard of that poll. But it doesn't exactly go against the grain of my Atlantic piece.