Senate Swings Democrat?

Nate Silver revises his prediction for the Senate majority in the November mid-terms on Five Thirty Eight.

When we officially launched our forecast model two weeks ago, it had Republicans with a 64 percent chance of taking over the Senate after this fall’s elections. Now Republican chances are about 55 percent instead. We’ve never quite settled on the semantics of when to call an election a “tossup.” A sports bettor or poker player would grimace and probably take a 55-45 edge. But this Senate race is pretty darned close.

Whatever the reason, the GOP’s path to a Senate majority is less robust than before. They still look pretty good in the “path of least resistance” states. But while West Virginia, Montana and South Dakota are extremely likely pickups, Alaska, Arkansas and Louisiana are not sure things. Meanwhile, Republicans have fewer top-tier backup options, as states like North Carolina and Colorado have trended away from them. Republicans may need to decide whether to consolidate their resources. It won’t help them if they lose each of Colorado, Iowa, New Hampshire and North Carolina by a couple of percentage points — and in the process blow a state like Arkansas.