Elections
On November 10, 2009, Barr became the first Republican to formally announce that he would seek his party's nomination to challenge incumbent 6th district Democratic congressman Ben Chandler. In the announcement, he touted his opposition to the Patient Protection and Affordable Care Act (which Chandler had also opposed) and the American Clean Energy and Security Act (which Chandler supported). Barr's campaign raised far more money than those of any of his five opponents in the Republican primary. Barr garnered 31,255 votes in the primary, while his opponents' totals ranged from 4,789 to 1,880.
In an interview with WKYT-TV in July, Barr denounced the recently signed Dodd–Frank Act that enacted new regulations on the banking industry. He called for an end to the practice of politicians earmarking funds for special projects in their districts, a position that put him at odds with state party leaders such as McConnell and long-time 5th district congressman Hal Rogers. He has supported strengthening security along the U.S. border with Mexico and has taken varying positions on birthright citizenship, at one point criticizing fellow Republican Senate candidate Rand Paul’s proposal as unconstitutional, and later introducing a constitutional amendment seeking to end birthright citizenship for children of undocumented immigrants.
The National Republican Congressional Committee targeted Barr's race against Chandler as part of its strategy to gain control of the House of Representatives during the 2010 midterm elections, and Ohio congressman John Boehner, who stood to become Speaker of the House if the Republicans gained a majority, visited the state to campaign for Barr. Substantial amounts of money from political groups outside the state aided both candidates and spawned a number of negative campaign ads. Chandler aired ads in August alluding to Barr's arrest in Florida for using a fake ID and seeking to tie him to the Fletcher administration's wrongdoing. Barr countered with ads criticizing Chandler's support of cap-and-trade legislation, an unpopular vote in coal-dependent Kentucky, and his vote in favor of the American Recovery and Reinvestment Act of 2009, which Barr characterized as a waste of taxpayer money that did little to stimulate an economic recovery.
Unofficial election day results showed Chandler narrowly defeating Barr, but the race was so close that Barr did not concede. When the official results were released, Chandler had received 119,812 (50.1%) votes to Barr's 119,163 (49.8%). Barr petitioned Kentucky secretary of state Trey Grayson for a recanvassing of the voting machines in the district, but this yielded only one additional vote for Barr. On November 12, ten days after the election, Barr announced that he would concede the election to Chandler rather than request a full recount.
On June 9, 2011, Barr announced that he would again challenge Chandler for his seat in the 2012 elections. Chandler responded to the announcement by declaring, "Next year, voters will have a very simple choice to make: whether to protect and save Social Security and Medicare, or to end them," an allusion to Barr's publicly expressed support for Representative Paul Ryan's budget proposal.
In July 2012, Roll Call reported that "a wide swath of influential Republicans in Kentucky see Barr's campaign as something of a lost cause...In the eyes of those who know Kentucky best, from Washington, D.C., to Frankfort, this isn't much of a race right now."
Barr won the Republican primary and again received financial support from the National Republican Campaign Committee in his general election campaign. When Chandler decided not to attend the 2012 Democratic National Convention, Barr charged that he was trying to avoid association with President Barack Obama, who was seeking a second term and was unpopular in Kentucky. A spokesperson for Chandler maintained that Chandler had previous engagements in his home district that week, but that he supported Obama's reelection. Barr was chosen to give a brief address at the 2012 Republican National Convention, during which he decried Obama's perceived hostility toward the coal industry. Chandler campaign staffers criticized Barr's decision to attend the convention, saying that he should spend the time in his district, getting to know the people there better. They also mocked the fact that the backdrop for Barr's speech was a picture of the city of Louisville, which is not in the 6th district; Barr's campaign countered that they had no part in choosing the backdrop.
Both candidates began their TV ad campaigns with more positive ads; Barr's wife appeared in his first ad, touting him as a "family man", while Chandler tried to combat Barr's charges of fiscal liberalism by releasing an ad criticizing excessive government spending. Tea Party-backed Kentucky senator Rand Paul endorsed Barr despite their differences on some policy matters, including Barr's support for the Patriot Act. The positive tone did not hold as the race tightened. Chandler's campaign attacked Barr for using a mining executive from Morganfield, which is well outside the 6th district, as a coal miner from Estill County, which is in the district. The campaign's charges that the man depicted was "not a miner" prompted him to threaten a suit for defamation, and he produced copies of his certified miner credentials in rebuttal to the charge. The Democratic Congressional Campaign Committee also bought adverts that again raised the issue of Barr's previous conviction and his association with Fletcher.
Barr won the election by a vote of 153,222 (51%) to 141,436 (47%).
Barr defeated Democratic nominee Elisabeth Jensen in the 2014 general election, by a vote of 147,404 (60%) to 98,290 (40%). Barr garnered wide support and raised substantial funds for the race.
In the 2016 congressional elections, Democrat Rev. Nancy Jo Kemper, a graduate of Yale Divinity School and former executive director of the Kentucky Council of Churches, challenged Barr in the 6th Congressional District. She ran with the support of former lieutenant governor Crit Luallen, state senator Reggie Thomas, state representative Susan Westrom, and Secretary of State Alison Lundergan Grimes. Barr was reelected with 61.1% of the vote.
Barr won the 2018 Republican primary. Former Marine fighter pilot Amy McGrath defeated Lexington mayor Jim Gray and state senator Reggie Thomas for the Democratic nomination. The race was considered potentially competitive by some observers. Barr defeated McGrath in the general election, 51% to 48%.
Barr faced attorney and U.S. Marine veteran Josh Hicks. Barr defeated Hicks in the general election, 57.3% to 41%.
Barr faced Democrat Geoff Young in the general election. Young came under fire for using Kremlin talking points while campaigning, most notably accusing the Ukrainian government of being run by "Nazis" following the Russian invasion of Ukraine. Young failed to receive the endorsement of the Kentucky Democratic Party after winning the Democratic primary. Barr won the general election 62.7% to 33.6%.
Barr faced Democrat Randy Cravens, an IT professional and former write-in candidate for the 6th district in 2022. Barr defeated Cravens in the general election, 63% to 37%.