I think you guys are missing the point. The question is, why is Joe Biden HELPING Pete by pointing out he’s no Obama?
Meant as a joke? Biden and Buttigieg are fighting for the votes of Democrats who voted for Obama twice and still respect him. Even in the general election, being associated with him won't be a negative with half the country.
But of course, the point seems to be making stupid and crude comments about what Buggatich does in the bedroom, and the commenters are right on target with that.