Democrats are seeking to win both chambers of Congress in the upcoming midterms after two years of struggling to slow the Trump administration agenda under a Republican governing trifecta. All 435 House seats are on the ballot, including 37 classified as competitive and 21 as toss-ups by the Cook Political Report. Republicans hold 218 seats to Democrats' 214, with two vacancies and one independent, meaning Democrats need a net gain of four seats to take control. Recent polling has shown Democrats narrowing or overtaking Republican candidates as President Trump's approval rating stays below 40%, although the party's progressive shift has also created challenges for some moderates. Five closely watched races include Ohio's 7th District, where controversial Republican incumbent Max Miller faces union ironworker Brian Poindexter; Texas' 34th District, where Democrat Vicente Gonzalez Jr. is defending a Republican-leaning seat against Army veteran Eric Flores; North Carolina's 1st District, where Democrat Donald Davis faces Republican Laurie Buckhout after redistricting; New York's 17th District, where Republican Mike Lawler is challenged by former National Security Council counterterrorism director Cait Conley; and Arizona's 1st District, where Democratic state Rep. Amish Shah is running against former NFL player Jay Feely. The contests reflect the effects of redistricting, immigration and border security, allegations surrounding candidates, national party figures and the continuing tension between moderate and progressive factions.