Data from Gallup:
The percentage of Americans expressing a great deal or quite a lot of confidence in Congress is the lowest for a trend that dates back to 1973. The high point for Congress, 42%, came in that year...
Democrats, independents, and Republicans are about equally likely to express low confidence in Congress. This is a change from the past and likely reflects the split control of Congress... Between 2009 and 2012, a period that saw Congress come under split control, these partisan differences gradually diminished, and this year, Democrats are a mere two percentage points more likely than Republicans to report having a great deal or quite a lot of confidence in Congress.
Americans' confidence in Congress is not only at its lowest point on record, but also is the worst Gallup has ever found for any institution it has measured since 1973.