 In February 2014, Marshall declared his candidacy for the District 10 seat in the House of Representatives being vacated by retiring Representative Frank Wolf (R-VA), calling the other leading Republican challenger Barbara Comstock weak on gun rights.Comstock defeated Marshall and four other challengers in the April 2014 Republican primary with 54% of the vote.In the run-up to the election, Comstock spent $240,000, more than sixteen times the spending of Marshall, who came in second place with 28% of the vote.