 WELCOME BACK TO CBS NEWS 24-7. I'M LINDSEY REISER. AS WE'VE BEEN REPORTING, PRESIDENT BIDEN GAVE HIS FIRST SOLO NEWS CONFERENCE SINCE NOVEMBER. AND HIS FIRST SINCE A POOR DEBATE SHOWING AGAINST DONALD TRUMP LAST MONTH RAISED QUESTIONS ABOUT HIS ABILITY TO KEEP RUNNING FOR PRESIDENT. DURING THE CONFERENCE, HE SAID HE'S STAYING IN THE RACE.