The casual political observer in Indiana would be confused. Sen. Joe Donnelly sounds like a Republican in his latest campaign spot.

For the record, Donnelly is a Democrat. And he competes with Sen. Joe Manchin of West Virginia for the title of "most moderate," though he rarely gets much of the same credit. Running for reelection in a deep-red state that Trump won by double digits has pushed him even further to the right. Watch his latest ad:

Donnelly condemns socialized medicine like a Republican would. Donnelly promises to defend protections for preexisting conditions like many moderate Republicans have. Donnelly says that the military needs more guns to kill more bad guys, like a Republican hawk would.

Then, the Democrat does the unthinkable. He quotes Ronald Reagan, telling the camera that military funding is necessary to ensure “peace through strength.”

If it works, Donnelly will go down as a master of disguise. Two short years ago, the Democrat was stumping for Hillary Clinton. Now, he is campaigning for his life and campaigning, like always, as a moderate. The RealClearPolitics average has Donnelly ahead of Republican challenger, Mike Braun, by just 2.5 points.

Another worrying sign for the incumbent — Braun out-raised Donnelly. The Republican brought in $5.6 million in the third quarter, but the Democrat brought in just $3.08 million. Money isn’t everything, of course. But it is enough to make him worried. With three weeks left before Election Day, it seems like Donnelly has decided to run as a Republican to keep his seat.