I think they'll do this for pretty much any candidate though.
Harris is the only one that has appeared on a national ticket and won, and specifically beat Trump in the past.
I don't think it's wise to completely dismiss the reality of how hard that is to do.
She won w Biden as head of ticket. She did not beat Trump herself. We have a very racist sexist country. Media will suddenly 'discover' the second she is head of ticket now/future. Happy to vote for her.
But are doing it to Biden and will to ANY Dem candidate cuz that's where their big profits are!