re: #13 Kragar

Biden runs, picks Obama as his VP. Resigns on his first day. Obama nominates Biden to be his replacement VP.

Nope, can’t work. Obama, having served two terms as president is not eligible to be VP because he is not eligible to be president under the 12th Amendment. There’s apparently some scholarly argument that the 22nd Amendment gives wiggle room to that rule but it seems a bit specious to me.