I think Obama is one of the best public speakers since Bill Clinton but his choice of candidates is questionable.
Kelly is an okay VP pick but a worse presidential candidate. There's no way he energizes the base, women, minorities and the youth like Kamala. He would just pull in some moderates but without the diverse coalition, Democrats are sunk.
And history has proven Hillary over Biden was another bad pick. Not only did she lose but I doubt her presidency would've been as impressive as Biden's, who I think we all underestimated. Like someone said, he governed left of Obama which few expected. (His biggest weak spot is Isreal's genocide). Too bad we didn't fully control congress for 2 or 4 years. He would've been gotten way more done (higher minimum wage, voting rights, child tax credit, etc)