Joe Biden freezes on stage and has to be walked off stage by his new handler, President Obama @mschlapp @mercedesschlapp https://t.co/0J5eCxUEuV https://video.twimg.com/ext_tw_video/1803444366016421888/pu/vid/avc1/1280x720/bealxBMDn6tYzB1b.mp4?tag=12