Hillary Clinton was willing to climb over dead bodies and rig the 2016 Dem primary to be President.
Nobody aspires to be Vice-President.
Who in Washington DC doesn't have ambitions to be President? That town is full of wannabe's and flunkies. If they can't be President, proximity to Power is the next best thing. It's an opportunity to raise one's profile, and profit from inside information, selling influence, and selling memoirs.