Here's how it would work:
Step 1. Organize a rumor campaign to give him a history of gayness. This is necessary to sell the frame up.
Step 2. Wait until your target is in a city where operatives sympathetic to your agenda will slap the cuffs on him. There is no other witness or evidence needed except the word of the cop which makes this crime unique as the most exploitable crime for a frame up.
Step 3. The senator has no way of proving himself innocent. It's his word against the cop's word with the whisper campaign predicate making it impossible for him to prevail so he pleads guilty to get it over with instead of dragging it out in court where it will be in the news every day for months. Whichever way the senator proceeds, the sting will have served its purpose.
I could easily see a conspiracy of D'rats going to these lengths to destroy a conservative but I'm not ready to believe that this was such an instance.
After Bush's term is up he better be careful not to be alone in a room with a liberal cop or that cop could slap the cuffs on him and say Bush asked him to sell him some cocaine. They had the rumor mills working overtime to create that history for Bush so the media would say "well, it's not like we didn't know he was a cocaine user so this is no surprise".
What..he just HAPPENED to know that little homosexual, public toilet mating dance? Bet he learned it in one of the many chatrooms where 'straight' and married men look for gay sex (and then go home to their wives and children, ugh). lol