Bimbo payoffs are now campaign finance violations???

Paying off a bimbo to keep her mouth shut is kinda slimey, and NOT an indicator of good moral character, but it ain't a campaign finance violation.  Even  Alan Dershowitz  agrees with me on this point.  Why this Cohen character, former fixer for Donald Trump, is pleading guilty to a campaign finance violation 'cause he cut the check[s] to one or two bimbos is a mystery to me.  You would think an experienced lawyer/fixer would put up more of a fight in court.  And for that matter,  I'd expect Donald Trump to do more than he has to keep an old buddy/fixer out of jail.