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He did tick up after the debate, but now Kamala is heavily favored for the Democrats.

Why is Obama (I assume Michelle?) in those odds (and, interestingly, at #3 right behind Kamala)? Has she ever indicated she might run?

No, those are just longshot odds that bookmakers, for whatever reason, have.

"for whatever reason"

Because enough people wanted to bet on it and they make money on every bet.