Last month, 11 percent of Americans approved of Congress, giving the U.S. legislature "good" or "excellent" performance ratings, according to Rasmussen. That number fell two points in today's poll, conducted via telephone July 1.
Democrats are increasingly dissatisfied with their majority, the polling firm found, as positive ratings fell from 17 percent to 13 percent among Democrats from last month.
Congressional approval has not climbed higher than 15 percent since the beginning of 2008, according to Rasmussen.
Rasmussen surveyed 1,000 Americans for today's poll.