Back in Roman times, a man who wanted to win elections was expected to borrow heavily so he could throw lavish celebrations, games, banquets and win the hearts of the voters. It was so expensive that borrowing was required of all but the weathiest families. They made it up by getting appointments later to provinces where there were ways for them to get paid by getting a take of taxes or war booty or whatever. It's one reason Caesar stayed in Gual so long. He needed money to maintain his political power base. He became super wealthy there, but his staying gave the senate an excuse to recall him to Rome for trial, a trial which would have surely been rigged and he knew it. So he came back but with his army.
Anyway, I don't really know why it's worse to borrow to fund your campaign than it is to beg to fund it.
Same thing with Trump and the emoluments BS.
It’s OK to take bribes in the form of “campaign contributions,” but don’t you dare earn your own money.