FiveThirtyEight

Only two House Democrats lost re-election bids

Party unity scores for Democratic representatives in the 115th Congress

Lost re-election

Left House

FiveThirtyEight’s party unity score measures how often someone votes with his or her party, which is calculated using a rolling average of each member’s voting record from up to the past three Congresses, if available, weighted by votes per Congress. Scores are up to date through Nov. 10, 2018. Members sworn in after Aug. 1, 2018, are excluded from this analysis.