Mom, raised in DC, used to say 'thats how things work in DC'. Lobbyists were a much stronger force in DC than constituents, I believe due to the 'out of sight, out of mind' effect. Politicians respond to the hand that feeds them, no different than anyone else.
Fortunately, lobbyists are going 'out of style', and the more vocal or active constituents are grabbing the ear, but, we're still a long way from habitually reminding our representatives that the people are government too, and that we are the ones who granted them their position, to serve not to rule. Not to serve our every whim, but to serve according to the powers WE granted THEM, as outlined in the Constitution.
That was Mom. Me, having watched this since the sixties, I blame it on Cool Aid.