Can someone explain how the Fundraising for the presidential campaigns fits in?

The linked article (From Polico, an online news service founded in Washington) seems to indicate that the more money someone has, the more likely they are to be elected :-( I know there is a lot wrong with UK politics but I don't think we have that problem yet! Can you also tell me that the fundraising for Trump cannot go towards his legal bills? It reads as though it does but surely that is fraud. Not that that matters to Trump.

A much more uplifting article from the same magazine (which I can understand) is 30 things about Biden you might have missed. Fire these back at Biden detractors. Not that they will take any nitice but at least it is good ammunition