But their edge is not as significant as the winning party’s advantage in the last two major wave elections, in 2010 and 2006. Eight years ago, Republicans held a 15-point enthusiasm edge, and they picked up 63 Democratic-held seats in former President Obama’s first midterm election.

Four years before that, Democrats had a 32-point enthusiasm gap, and the party picked up 30 seats.

“Democrats are angry, and that’s not changing in the next 100 days,” said Ron Klain, a Democratic strategist and former chief of staff to Vice Presidents Joe Biden and Al Gore. “The unknown is whether that anger turns into a huge turnout.”