2012: Folk ran in the May 8, 2012, Republican primary and won by 17 votes with 485 votes (51.4%), and won the November 6, 2012 general election with 3,096 votes (51.2%) against Democratic nominee Donn Marshall, who had run for a seat in 2010.
2014: Folk won re-election to the 63rd District, defeating Heather Marshall — wife of his 2012 opponent — by receiving 60.99% of the vote.
2016: Folk won a third term in the House by defeating Democratic challenger Kenneth Lemaster, receiving 58.5% of the vote.
On July 15, 2016, Folk tweeted that Hillary Clinton should be "hung on the Mall in Washington, DC" in response to her email controversy. He later stated that he regretted the comment, but reiterated his belief that Clinton should be tried for treason. Two days later, Folk was suspended from his job as a pilot for United Airlines over the comment.