All of the votes haven’t even been counted in the 2016 elections, but it’s not too early to look ahead to 2018.

Even before Nov. 8, there was plenty of discussion (and even an expectation) that Republicans would bounce back from this year’s election losses due to a favorable Senate map in 2018, particularly with Hillary Clinton in the White House.

But Republicans held serve this year (only losing two seats and retaining control of the chamber), and now have an opportunity to turn that favorable map into a filibuster-proof majority. In two years, 10 Democratic senators will be up for re-election in states won by Donald Trump this year.

In some cases, the discrepancy is dramatic.