However, this is a criticism you see all the time from right-wing pundits and commentators; Republicans go to DC and forget their constituency so they can hobnob and go to cocktail parties.
Going to admit straight off that this is based mostly on my own perception of the right, but... I think that these complaints are misattributed.
I think the republicans behave pretty well the way their conservative constituencies expect them to the overwhelming majority of the time. (The one thing I see cited most often as a major failing of the Democrats is their party discipline nowhere near matches that of the Republicans) And conservatives just get pissed off when this doesn't get them the result they expected, either because their party representatives lost a political battle or they did get their way and didn't like the results. It seems like the most common reaction when this happens (which is quite frequently anymore) is they conclude that things didn't work out because they weren't conservative enough, so they raise the bar for ideological purity and attack any of their representatives who don't match the new standard.
Example: Economics -- We've seen nothing but de-regulation of the economy for a very long time now. The result has been a ton of corruption taking advantage of that de-regulation and a consequently shitty economy. The conservative response to this is
always to demand more de-regulation.