Why do individual members of Congress tend to be more popular than Congress as an institution?

What will be an ideal response?

Congress tends to be judged by the policies it adopts, the processes it adopts to take decisions, and overall satisfaction with the economy and other national indicators. These tend to be fairly poorly understood by voters. In contrast, individual members are judged on personal qualities and positions, which they can closely tailor to the opinions of their district, as well as constituency service.