Republicans like their chances in Iowa's 2nd district, where Rep. Dave Loebsack (D) faces a challenge from John Archer (R), a former John Deere attorney.
Anticipating a tough rematch, he started to fundraise and air television advertisements early. He made several trips to Des Moines, which many Democrats say help lay the groundwork for a future statewide bid. This remains Iowa's least competitive House district, but that's no longer a low bar. Roll Call is changing its rating of this race from Safe Democratic to Likely Democratic.
But while Republicans are boosted by more competitive races in eastern Iowa, Democrats see more opportunity than ever in the western part of the state.
Latham built a big fundraising lead early on, thanks in part to his close friendship with Speaker John Boehner (R-Ohio). National and local Democrats sent their dollars north to the 4th district instead.
But good fundraising alone does not win races - especially in competitive districts like this one based in Des Moines. The redrawn district only marginally voted for Sen. John McCain (R-Ariz.) in 2008.
Democrats are more confident in Boswell's chances than they have been in months, even though they still privately concede that the race is an uphill battle.
An analysis of the recent advertisement traffic underscores the lingering competitiveness of this race. Latham kicked off the airwaves fight with a couple of positive spots. Boswell started his television campaign with spots attacking Latham, and now the Republican has returned the favor with a negative spot of his own.
Simultaneously, Democrats are more optimistic about former Iowa first lady Christie Vilsack's bid to dethrone Rep. Steve King (R) in northeastern Iowa. National dollars have flooded this district, including a recent $400,000 buy from House Majority PAC, a Democratic super PAC.
Money goes further in this region than in Des Moines, as the district hosts some of the cheapest media markets, such as Sioux City and Mason City, in the state.
As a result, King has not been able to put the race away more than a year after Vilsack announced her candidacy. GOP internal polling shows a single-digit race with King picking up less than 50 percent of the vote. This week, one plugged-in national Republican privately named King as one of the five GOP incumbents most likely to not return to Congress next year.
House Republicans responded by adding time to their fall buy for the 4th district. About two weeks ago, King went up with his own spots to answer Vilsack, who has been on the air since mid-August.
Still, there was enough early concern about King's flagging campaign that Branstad got personally involved in the race. Last spring, he sent two of his top staffers to run King's campaign and communications operation. Branstad also opened doors to Des Moines donors and, as a result, King's fundraising improved greatly this year. King raised more so far for this race than in his past two campaigns combined.
Republicans speculated that Branstad's motivation was threefold: He wanted to see King win, keep his own campaign operation strong for his 2014 re-election and, most important, eliminate the possibility any future Vilsack will hold office in the state.
King has room for error. Republicans have a 52,911 voter registration advantage in the district, according to the most recent tally from the Iowa secretary of state.
Rep. Elijah Cummings, D-Md., right, hugs Harold Schaitberger, General President of the International Association of Fire Fighters, after the Congressman spoke at the IAFF's Legislative Conference General Session at the Hyatt Regency on Capitol Hill, March 9, 2015. The day featured addresses by members of Congress and Vice President Joe Biden.