Biden is a vicious and highly effective partisan. He invented Borking, he invented Anita Hill, he chewed Paul Ryan to bits.
He’s the most dangerous RAT by far - and has synergy with Fauxcahontas.
If I was Obama, I’d arrest all 3 Clintons tomorrow.
Then you'd be risking a data dump of all the information that the Clinton Mafia has been collecting about you. Obama vs. Clinton is a mutually assured destruction scenario, hence unlikely to seriously damage either side, and even more unlikely to benefit the American people.
Maybe vicious, but I think Sanders cultists may not like him much.