In 2006, Loebsack narrowly defeated 15-term Republican incumbent Jim Leach in one of the biggest upsets of the cycle. Loebsack was nominated by a special convention of the 2nd District after failing to get the required number of signatures to be on the primary ballot. Since there was no one qualified for the ballot, the convention was called to determine the nomination. The 2nd had been trending Democratic for some time (a Republican presidential candidate had not carried it since 1984), and was considered the most Democratic-leaning district in the state. It was taken for granted that Leach would be succeeded by a Democrat once he retired, but he was not considered particularly vulnerable due to his moderate voting record, popularity, and longtime incumbency. Loebsack won largely by running up an 8,395-vote margin in Johnson County, home to Iowa City.
Loebsack was easily reelected in 2008, taking 57 percent of the vote over Mariannette Miller-Meeks, a doctor from Ottumwa and the former president of the state medical society.
Loebsack faced Miller-Meeks again in 2010 and had a much more difficult time of it than he had two years earlier. He prevailed with only 51% of the vote, largely by running up a 13,900-vote margin in Johnson County. Terry Branstad easily carried the district in his successful bid to reclaim the governorship. Chuck Grassley carried every county in the district except Johnson; in fact, Johnson was the only county Grassley lost in his bid for another term.
After redistricting moved Loebsack's longtime home in Mount Vernon to the 1st District of fellow Democrat Bruce Braley, Loebsack moved to Iowa City in the reconfigured 2nd. The redrawn district is less Democratic than its predecessor; it regained Davenport, which had been the anchor of the 2nd and its predecessors for decades before being shifted out of the district in the 2000s round of redistricting.
Loebsack won the election with 55.4% of the vote. His Republican opponent, John Archer, got 42.5%; Alan Aversa, an Independent candidate, received 2.2%. Braley won the 1st district with 56.9% of the vote.[7]
In October 2016, the Daily Iowan endorsed Loebsack, saying that while he was "not perfect" he displayed a "willingness to work with the other side" and had "maintained some degree of competence in office."[9] Loebsack defeated surgeon Christopher Peters, 54% to 46%. Again, Loebsack was the only Democrat that Iowa sent to the House in 2016. The state was won by Donald Trump by a comfortable margin, and Republican Chuck Grassley was re-elected to the U.S. Senate by a landslide.[10] Despite the Republican swing in Iowa, Loebsack managed to hold his position as a Democrat.
In a rematch of the 2016 election, Loebsack defeated Peters by a comfortable margin with 54.8% of the vote. Democrats also flipped the 1st and 3rd districts in this election cycle; therefore, Loebsack was no longer the sole Democratic member of Iowa's congressional delegation.[11]
Tenure
Taxation
In November 2017, Loebsack was the only House member from Iowa to vote against the GOP tax reform bill, claiming the "tax plan that was rushed through the House of Representatives will hurt everyday Iowans."[12]
Immigration
In September 2017, Loebsack told Ottumwa voters that he supports Dreamers. He said, "We've got to do everything we can to protect them."[13]