Well it seems a bit unfair since no one answered my questions, but I'll bite.

Kamala Harris has lower poll numbers because she has not been campaigning for herself. Being at the bottom of the ticket is not the same.

Once she is nominee, she will have hundreds of millions of dollars to sell herself to the American people. She will be front and center in campaign rallies, press briefings, high profile interviews, and (hopefully) the debate stage against Trump.

What can Kamala do that Biden can't? She can speak without showing obvious signs of dementia.

It's been 8 years of Trump vs. Biden, most voters know where they stand in that race. But Harris vs. Trump means voters can reevaluate their position and get a fresh view. Democrats are being destroyed in the polls, they desperately need a refresh.

I think most people don't care about their primary votes- remember it was mostly Biden vs. Uncommitted. People understand it was not a real primary when theres only 1 viable option on the ballot. I think the overwhelming majority of the party will gladly adopt Harris now that Biden has shown how bad his dementia is progressing.

Kamala is not charismatic, her politics suck, but at least her brain works well enough so that she would have a shot at beating Trump.