"Since I'm the president and Democrats have controlled the House and the Senate, it's understandable that people are saying, you know, 'What have you done?'"

This quote by Barack Obama is describing the criticism he has gotten for not achieving more throughout his presidency. He is acknowledging that because he is the president and Democrats have actually controlled the House and the Senate, individuals are anticipating him to have done more. He is implying that he has been restricted in what he can do due to the political environment and the lack of cooperation from the other party. He is also recommending that he has actually done a lot, but it may not be as visible as individuals would like. He is trying to describe that he has done a lot, but it may not be as obvious as people would like. He is attempting to reveal that he has done a lot, but it might not be as visible as people would like. He is attempting to emphasize that he has done a lot, but it might not be as evident as people would like.