It looks like he downloaded child porn, which is deplorable. There may be mitigating circumstances that will come out at trial, however. Someone may have hacked him, or he might have been trying to find out how available it was for investigative purposes. I am not excusing the behaviour, but i do believe that even Trump Republicans are entitled to a fair hearing before we convict them.
I would also point out that even perverts are entitled to honestly held political opinions, which may be sincere and well thought out. Ted Bundy was a serial killer, but also a committed fiscal conservative who once actually worked for the Republican party. Former Republican Senate leader and current Heritage Foundation Tom DeLay went to Guam for sex parties arranged by lobbyist Jack Abramovitch.
I am sure there are equivalent Democrats. Being kinky, or even outright evil about sex does not deprive a citizen of their right to an opinion, nor does it make that opinion less valid. That being said, the Republicans do seem to be amazingly tolerant of perversion in their own while condemning it in others. Roy Moore was nominated and almost elected to the Senate despite his penchant for little girls, and President Trump has been a known molester for decades. Perhaps the state senator in your question is attempting to build a resume that will carry him to the White House.
Seriously, though, I had a friend who was a high school vice principal who was accused of fondling a student who actually made the accusation to revenge herself on him for a disciplinary action. That did not stop the media from spreading his name and the accusations around before the real story came out. We should wait for the facts before we rush to judgement.
He should get a fair trial, and then we can hang him.