13. What race for the House of Representatives was closest, with a margin in the single digits?
From Quiz Congressional Elections of 2020
Answer:
Iowa 2
Iowa's Second District was open due to the retirement of Democrat Dave Loebsack. Iowa Democrats were optimistic about holding on to the seat following their successes in the 2018 elections. Former State Senator Rita Hart (Dem) faced off against current State Senator Mariannette Miller-Meeks (Rep), and Miller-Meeks was certified the winner with a margin of six (6) votes out of almost 414,000 cast.
California 25 covers Los Angeles and Ventura Counties. Incumbent Republican Mike Garcia, who won a special election in May 2020, was facing off against State Representative Christy Smith. Garcia held on to his seat by a 333 vote margin, with both candidates getting just over 169,000 votes in a race that cost $13.6 million.
In Illinois 14, freshman Lauren Underwood held onto her seat against millionaire James Oberweis, winning by around 5000 votes, 50.6 to 49.4.
In Arizona 1, incumbent Democrat Tom O'Halleran defeated Tiffany Shedd 51 to 48, winning by about 12,000 votes.