 Because there's just no chance of him winning as this race is presently constituted. Biden is losing, according to a CBS News poll. OK, you got 72 percent of voters say he should not run for president. And that includes 46 percent, 46 percent of Democratic voters. Biden sucks. But it's not even that he's doing a bad job. It's that they saw him the other night attempting to explain his ideas to the American people and realized he didn't have any.