Why Is Tulsi Gabbard Still in the 2020 Presidential Race?

Tom Steyer, Pete Buttigieg, Klobuchar, and now Mini Mike Bloomberg who all had significantly more demonstrable support among voters, have dropped out. 

I wonder why Gabbard is staying in the race? 

CNN anchor Anderson Cooper says: "What's the agenda? To be a Fox contributor, isn't it? I mean, I don't have any information, I'm just assuming—that's where she appears"