I think the second part can be answered by the polls that are always taken about how people perceive Congress vs. their own representatives in Congress ... they despise Congress (typically giving it a rating in single digits or teens), but they adore their own Congresscritters (typically rating them in the 90+ range; with rare exceptions).
As for President: what other position does everyone in the country vote for? Because of that, no POTUS candidate is ever going to get a 90+ rating. Top that off with the fantasy that many people have, that the President can somehow ride roughshod over Congress to make it accomplish something and get government running efficiently and effectively.