The 2018 midterm terrain looks a lot different now than it did at the start of the campaigns. Races that many expected to be close, aren’t. Candidates that were assumed to be safe now find themselves in fights. And the Democrats have been the biggest beneficiaries of the changes.
A look at the numbers shows how the field has tilted in the last year-and-a-half.
Start with the most basic measure, the number of House seats that are thought to be competitive. CONT.
Dante Chinni & Sally Bronston, NBC News