

The cracking in the DNC was obvious. Even back to the 2000 Supreme Court interference with the Bush Gore Election. Kerry was a weak candiate in 2004, Obama only barely got past Hillary Clinton in the primary because he was wildly popular when he should have sailed to victory without issue but then they failed to keep any inovations from that 8 year period (get out the vote, social media savy, youth outreach, etc. ) when Clinton came sweeping back in 2016 and wondered how they lost that momentum.
Tradition or not, there’s no reason the DNC needed Obama to bless a chair candidate. They chose to throw progress and his contributions away.