The most significant reality about congressional decisions is that officeholders usually win. Not exclusively accomplish more than 90 percent of the occupants looking for re-appointment to the Representatives house win; however, the vast majority of them earn over 60% of total votes.
In any event, when challengers' situations on the issues are nearer to the voters' positions, officeholders still will, in general, win. Voters are not mindful of how their legislators and agents vote.