“The basic assumption here is that if you’re liberal, you’re much more likely to give to liberal candidates,” Bonica said. The scores track closely with DW-Nominate — a widely used measure of left-right lean based on voting record. But that score only works for legislators. We have excluded candidates with fewer than 20 donors because those scores are less reliable. (Explore House races and read more on how the score works below.)

Source: Washington Post April 11, 2018 16:41 UTC