When? Last time he didn’t want to run and pushed for Warren to run he didn’t. And then he pushed Clinton more left for staying in. This time he was considered a front runner after the opening states and he’s still mathematically in despite it being a long shot
This is Biden’s 4th time running and only time he got a single state. Hillary also ran twice in a row, and her 2008 run caused far more pain and damage to the front runner (like emergency meetings had to happen and it’s quantifiable she did more damage