Between the lines: As this interactive graphic shows, the party in power tends to do well in the House during midterm elections when voters are happy with the economy, but it does poorly when the president’s approval rating is low. There’s no recent precedent in which the economy is doing well but the president’s approval rating is underwater.

What they’re saying: I asked Darrell West of the Brookings Institution his thoughts on these trends:

“Generally, it’s been ‘the economy, stupid,’ that’s been the major issue. But this year it could be, ‘It’s Trump, stupid.’ Because Trump just dominates everything. He dominates news coverage, he dominates social media activities. He’s a very inviting target for Democrats.”