I remember when this story first came out. It was a stupid thing to point out because it had nothing to really do with his politics. Whether or not he wrote Bigfoot Erotica is irrelevant because the district is solidly Republican. He could have written stories of his favorite furries and which ones he likes to get down with and he still would have won with the Solid R behind him. I mean he already won with Bigfoot Erotica attached to his name.
I think something that drives liberals crazy is that conservatives can basically do whatever the fuck they want so long as they're conservative. Liberals who sneeze in the wrong direction end up pilloried.
of course, Bob Menendez won so a lot of it is pure partisan hackery.