Congressional Quarterly rates Iowa's 3rd and 4th districts as among the top 100 of 435 potentially competitive U.S. House races.
The individual district writeups are contained in the fun interactive map. Of Boswell, CQ sums up his relatively easy 2008 win over the unnamed Kim Schmett and notes:
Yet the Democratic Congressional Campaign Committee has designated Boswell as a member of its 'Frontline Democrats' program, which provides additional campaign support to incumbents deemed potentially vulnerable in the 2010 campaign. The Republicans may get a comeback try by former state GOP chairman Michael Mahaffey, who narrowly lost to Boswell in an open-seat race in 1996 and has said he’ll make up his mind by Labor Day about whether he’ll run again.
Potential opponents Mike Mehaffey and Robert Brownell, and `06 rival Jeff Lamberti, get name-dropped. But no mention at all of Ed Fallon's `08 primary challenge.
"Democrats now are searching for a candidate who might make a stronger race of it in 2010," CQ says of Tom Latham and the 4th CD. Overall party ID seems to be what puts this race on the map.
As for Democrats Bruce Braley and Dave Loebsack and Republican Steve King: CQ Politics rates this race as "Safe," meaning the incumbent party is virtually certain to win the seat.