As you probably heard by now, President Obama and Senator Bernie Sanders met behind closed doors this morning at the White House. The meeting was at SandersR...

As you probably heard by now, President Obama and Senator Bernie Sanders met behind closed doors this morning at the White House. The meeting was at Sanders' request.

The Senator says he's been a good friend of the President ever since they served together in the Senate and simply wanted some friendly advice. The meeting lasted more than an hour, with no aides involved. Sanders says he'll keep campaigning ahead of the D.C. primary next Tuesday, but made clear his chief political opponent is no longer Hillary Clinton.

After the meeting, Sanders told reporters, "I look forward to meeting with her in the near future to see how we can work together to defeat Donald Trump." That's serious shift in tone for Sanders, who frequently dismisses talk of him possibly losing the nomination.

Following his meeting with Sanders, President Obama endorsed his party's presumptive nominee, Hillary Clinton, in a web video. In the 3 minute clip, President Obama says, "I don't think there's ever been someone so qualified to hold this office."

Clinton, in response, thanked Obama on Twitter, writing, "Honored to have you with me @POTUS. I'm fired up and ready to go!"

President Obama plans to hit the campaign trail for the first time in nearly 4 years, with Clinton next week in Green Bay, Wisconsin.