As one of the posters above mentioned, Senators, Representatives and even the Ombudsman can't force USCIS to do anything, but in my opinion it helps to keep the pressure on. It also helps with your own sanity, knowing that you are doing everything you possibly can do.
In my case, I was pretty sure moving states was going to get the case moving, which it did. If that hadn't worked, my final plan was to sue.