Voters are free to use any number of criteria when when they step into the voting booth, and those criteria are certainly broader than "did this candidate break the law in the past." As an example, if I learn that a candidate used to run one of those shady payday loan operations, bilking unsophisticated people out of millions they cant afford, that is absolutely something I would want to know prior to the election. Some people wouldn't care at all, but for me it would be an automatic disqualifier. Televangelists, ambulance chasers, and guys that fly "lets go Brandon flags" would get the same treatment, even though there is nothing illegal with those activies. Certain backgrounds/behaviors in my mind simply indicate a candidate lacks the moral compass necessary for the job. And those criteria are different for each voter.
I have no issue with pornography or sites like Chaturbate, but it would be naive to think nobody does. I also believe that when you choose to run for public office, your past employment/income is fair game for discussion. This isn't a scenario where an unsuspecting participant was surreptitiously recorded in the act, only to have a jilted ex later release the video without consent. She and her husband willingly chose to fuck online in front of an anonymous internet audience for money. They are certainly entitled to do so, and the money supposedly can be surprisingly good. But you have to own it.
From my understanding, this was all recent activity, not something that was uncovered regarding a long ago past when her life circumstances might have been much different. She's an RN, and he's a lawyer, so presumably they have the means to a decent life without fucking for tokens. But since they choose to fuck for tokens, I struggle to see why this should be off limits. She just has to convince a majority of voters that she is still the best candidate for the job. No different than any other number of personal indiscretions that while legal (drinking, gambling, cheating on a partner, etc...) can absolutely dominate political campaigns. Once you start filing 1099's, its fair game. If it didn't show up on her tax returns, she might have bigger issues.