I wonder where you are getting your information from, Harris is doing well in her campaign and the automatic endorsement by Biden, Obama, Clinton and others has helped her to be almost unanimously nominated by the Democratic party
Don't forget Putin's support
Frankly speaking, being endorsed by a president who was removed from the campaign because he wasn't doing well and another that was impeached isn't something she should brag about.
Also, the way she did not participate in the primaries, but still got to participate in the general election is a bit shady.