It’s widely believed at MSNBC — including among network brass — that Scarborough is actively mulling a presidential bid, sources said.

Meanwhile, some of Scarborough’s guests are beginning to talk him up as a possible candidate. Mark McKinnon — the former adviser to George W. Bush and John McCain who co-founded the group No Labels and appears on Morning Joe regularly — said he has talked about the prospect of a White House campaign with Scarborough “ever since we first met years ago, but always in the abstract.”

“On paper, he’s a great candidate,” McKinnon told The Daily Caller. “He has the kind of confidence, ideas and media savvy required to make it on the big stage. And he’d be a lot of fun to watch because he wouldn’t be afraid to mix it up with anybody on any topic. I think it would be highly entertaining and good for the party.”