Three large polling organizations, Pew Research Center, Rasmussen Reports and Gallup, show favorability ratings of the U.S. Congress. The pollsters further divide the polls into various categories seeking opinions on Republicans and Democrats and seeking opinions of various classes of U.S. residents.
As specific issues come to the forefront, these and other pollsters, including universities and news media outlets, poll the public. For example, in September 2015, the University of Maryland's Program for Public Consultation polled more than 700 people on a proposed deal to limit Iran's nuclear program. The poll, which was reported by many news media outlets, found that a majority of respondents wanted the U.S. Congress to uphold the White House deal.
The website PollingReport.com aggregates other organizations' polling results.