I never realized it before but staffers are incredibly powerful. They do all the work, prepare the information they want to be put forth, and present it to the congressperson or Senator in a neat little package, who in turn, espouse it and vote accordingly. I’m sure every congress critter doesn’t operate that way, but I’m betting most do. They’re too busy campaigning for the next election than doing the work themselves, especially House members.
Oh yeah, that is their role.