历史表明，民主党在中期选举中将赢得席位。但共和党主导的重新划分选区行动可能使他们争取参议院多数席位的道路更加艰难。以下是值得关注的选区。
History suggests Democrats will gain seats in the midterms. But a Republican-led redistricting push could make their path to a Senate majority more difficult. Here are the races to watch Republicans in the US House of Representatives are defending a narrow majority in November's midterm elections.
共和党在美国众议院中以微弱优势守住多数席位，将在11月的中期选举中进行角逐。历史表明，民主党将赢得席位——他们需要净增四席才能夺回众议院控制权。但共和党已发起全国性的重新划分选区斗争，这可能使民主党争取多数席位的道路变得稍微更加困难。
History suggests Democrats will gain seats - they would need to net four to win control of the chamber. But Republicans kickstarted a national redistricting battle that could make Democrats' path to a majority slightly more difficult.