On top of the Des Moines Register going for Clinton, The Boston Globe doing for Obama, and Joe Lieberman going for John McCain, there are yet more endorsements today:
Marie Culver, wife of Iowa Governor Chet Culver, endorses Edwards. In 2004, when Kerry won the endorsement of Tom Vilsack's wife, it seemed to help him out quite a bit.
Republican Iowa Representative Steve King said he would endorse Romney, but then endorsed Thompson. Romney's campaign officials were even in the room when he made the announcement. I know that I am cheering for Romney on the Republicans side, but this is still pretty funny.
It is difficult to say how much endorsements matter. My guess is that they matter a little bit, but not too much. Even the big ones from last election cycle probably coincided with surges from Edwards and Kerry, rather than causing surges by Edwards and Kerry.
Update Nice insight from Dave Kowalski in the comments:
Looking at the three House members: Braley was President of the Iowa association of trial lawyers. Natch, he goes for ex-trial lawyer Edwards. Loebsack is an ex college professor. Again, makes sense that he goes for the former part time law school instructor Obama. Boswell is old and ex military. Hillary is the choice.