text:  From ABC News, I'm Richard Cantu. It's hard to debate a liar. President Biden's words after last night's CNN presidential debate, during which some wags called into question his performance. There is no question this is not the night that the Biden campaign wanted or needed. They were going into this hoping that the president's performance would put to rest those remaining concerns about his age. He had a rough start. He was rambling. He struggled at times. ABC's Mary Bruce, not much policy talk.