Trump now trails Joe Biden by nine points in the FiveThirtyEight average, roughly matching Democrats’ average lead on the generic congressional ballot and seven points larger than his 2016 popular vote deficit. But because there are plenty of solidly blue urban districts where Trump didn’t have much room to fall in the first place, his decline is especially acute in swing suburban districts with lots of college graduates.

Republicans began the cycle hoping to pick up 18 seats to win the majority back. Now they’re just trying to avoid a repeat of 2008, when they not only lost the presidency but got swamped by Democrats’ money and lost even more House seats after losing 30 seats and control two years earlier. For the first time this cycle, Democrats have at least as good a chance at gaining House seats as Republicans on a net basis.

This week, we’re shifting our ratings in 20 races, all reflecting movement towards Democrats.