text:  ABC News, I'm Brian Clark. Despite Thursday's debate, the Biden campaign insists the president is not exiting the race. ABC's Mary Alice Parks has more. They still believe they can win this if they organize, they do this on the ground. I had one interesting conversation I thought was worth noting with a former Bernie Sanders staffer. She now works for Democrats that are really invulnerable districts, and she said that. She said, put your head down and do the work. She said, my guy had a heart attack.