Trying to blackmail Ukraine into providing dirt on his political rival by withholding congressional funding, getting rid of Comey, and requesting that some additional votes for him should be found are the top 3 that come to my mind.

I couldn't give two shits about extramarital sex, and I honestly would have expected him to write about said sex on twitter sooner than cover it up. I don't think the campaign donors would have been too steamed about where that money went either. It's not like him dipping into his other charities (which I find more despicable than hush money.)

I wonder why this was the charge that stuck.