CHARLOTTE—It’s been raining every afternoon here during the Democratic convention, but from talking to the locals here in Carolina, short afternoon showers are pretty common this time of year. One imagines that way back when Democrats booked the 74,000 seat Bank of America stadium for Obama’s acceptance speech, someone did the due diligence to inquire what the weather might be like in Charlotte this time of year. The possibility of rain must have been considered.

So when the Obama campaign announced today that they were moving the President’s acceptance speech from the outdoor stadium to the indoor 20,000 seat Time Warner Cable Arena, there are good reasons to be doubtful that this is happening because the forecast is a 30 percent chance of rain.