The interest from the closely guarded world of Mr. Obama and those around him is the clearest sign yet that Mr. Mamdani is likely to be embraced by the Democratic mainstream, whether the party’s leaders and donors like it or not. It comes at a time of dueling visions among voters, Democratic politicians and donors over the future of the party.

It seems very possible that Obamaworld views [Mr. Mamdani]: not as a threat or a liability, but as a promising figure in a Democratic Party with a pressing need for fresh blood.

For the americans here, the labour party was held by right wing labour ever since Blair. Corbyn got the labour leadership because some people suggested it would be a good idea to have the left wing voice in the leadership contest as an influence for party ideas. They believed it didn't matter and that there was no way he would win so it would be totally harmless to have him there and absorb his ideas into the party for greater popularity.

Next thing they knew, he was party leader.

I know the Dem party is structured differently but their belief in harmlessly absorbing Mamdani seems like a similar kind of arrogance leading to a critical mistake as was made with Corbyn. The biggest difference being that he can't run for president obviously.