It's not just this endorsement and putting aside the fact that I don't really agree with her stances on some major issues but it's just that she ain't gonna win the nomination. I think everybody besides Buttigieg, Harris, Sanders, Warren, Biden and maybe O'Rourke and Yang should just drop out rn. If you're polling a 2% or lower still there's just realistically no point to continuing.
There are a lot of reasons to run, winning the nomination isn't the only one. In basic it provides a lot of attention. And this can be quite useful. So running in this race might be used to:
- get attention to then use it for another political race (Hickenlooper for Senate)
- use it to write a book to make money
- spread an idea or political stance with stronger attention (this might be the reason for Yang, Gabbard, Williamson and Inslee)
As long as they can get the attention it still is worthy for them to stay in the race.