To a superpack otherwise they are limited to individual limits. Super Packs pay more for ads during a campaign.

I must admit that I don't know all the nuance of campaign finance laws, but the donors gave their money to a particular campaign. It isn't completely clear to me under what circumstances those funds can be pledged to another candidate without getting the original donors' sign-off. But as I understand it, much of the Biden/Harris money is restricted to the campaign.

They can donate the entire fund to the DNC. And then the DNC can choose to transfer it to the new nominee. There are a few technicalities though.

Generally no. They could refund their donations and ask their donators to donate to the new campaign. Or they could donate to a superpac.

You think Harris would abdicate?