President Barack Obama appeared on Hillary Clinton's YouTube channel Thursday to endorse her bid for the presidency."I don't think there's ever been someone so qualified to hold this office," the president said into the camera in the three-minute video. He also used her campaign slogan when he added, "I want those of you who've been with me from the beginning of this incredible journey to be the first to know that I'm with her."Despite the race for the Democratic nomination being "hard-fought," Obama described himself as, "fired up," and ready to "get out there and campaign" for the woman who was his rival for the same nomination eight years ago.Speaking on Thursday just after a meeting with the president, Clinton's rival, Senator Bernie Sanders, thanked Obama for remaining impartial so far during primary season. Sanders has steadfastly refused to quit the race despite Clinton breaking the nominee threshold on Tuesday that elevates her to the status of presumptive Democratic nominee.Obama praised Sanders in the video for running "an incredible campaign," and said he was glad Sanders had brought attention to "issues like income inequality and the outsized influence of money in our politics."Follow Mike Pearl on Twitter.