Radio Iowa is on the story:

For the first time in his 22-year political career, Iowa Congressman Leonard Boswell has endorsed a Democratic presidential candidate in the heat of the primary season. Boswell announced this morning that he and his family are backing Hillary Clinton's bid for his party's presidential nomination.

"I'm not against anybody but we have to make a decision. This country is in peril. Our world is crying out and I want somebody that can win and can bring experience to this. As (my family) went through all this...we kept coming back to Hillary every time because we've got to win," Boswell said, slapping his hand on the lectern to emphasize his point.

Boswell plans to campaign with Clinton and on her behalf in the three weeks that remain in the Caucus campaign. According to Boswell, he was swayed by Clinton's stances on a variety of issues from energy to education to the economy.

This one is an important one for Clinton, not necessarily in the sense of helping her build her Iowa organization (because I don't get the sense that Boswell has the strongest grassroots organization in the world even though he has been able to win races in the state for decades) or even in the sense that a Boswell endorsement is going to move a whole lot of votes in Iowa. Clinton really needs some positive news, particularly in the early states but also around the country, following what has seemed to be an unending flow of difficult news cycles in recent weeks. Indeed, if you look at the trend -- whether in Iowa, in New Hampshire, and even nationally -- it's been a tough couple of months for Clinton, with her support dropping noticeably as of late. This story won't necessarily arrest that trend, even in Iowa, and it's a little weirdly timed (document dumps, not major endorsements, are usually announced on Fridays). That said, a positive news cycle is a positive news cycle. And as we get closer and closer to caucus day (it's less than three days away), having more positive than negative news cycles really does matter.