每两年，美国众议院全部435名议员以及约三分之一的参议员都要面临改选。中期选举让选民在总统四年任期过半之际表达意见。以下是对多年来得失情况的回顾。从总统所属政党的视角看中期选举的得失
Every two years, all 435 members of the US House of Representatives and around one-third of the Senate are up for election. Midterm elections let voters weigh in halfway through a president’s four-year term. Here's a look at the gains and losses in over the years Viewing gains and losses in the midterms through the lens of the president’s party