Instead of the hubris to hold onto the job until death and thereby subsequently undo many of the things she spent her life fighting for.
A bit off-topic, but this seems to be an ongoing problem for the Democratic party. They just lost an important vote on a budget bill in the House by a single vote, because Gerry Connolly wasn't willing to give up his House seat and instead clung on until he (very predictably) died of cancer a few days ago.
But if the Democratic guy had stepped down and they had a non sick person then the story would have been much better: Republican bill fails because one of their members was asleep and missed the vote.
A bit off-topic, but this seems to be an ongoing problem for the Democratic party. They just lost an important vote on a budget bill in the House by a single vote, because Gerry Connolly wasn't willing to give up his House seat and instead clung on until he (very predictably) died of cancer a few days ago.