The performative pressures posed by presidency 

From The Confidence Men, by Ron Suskind, pg 789:

During so many days of crisis in his first two years, Obama often felt that performance pressure—having to play the part of president, in charge and confident, each day, in front of his seasoned, combative, prideful team, many of whom had, all together, recently served another president. As he confided to one of his closest advisers, after a private display of uncertainty, “I can’t let people see that, I don’t want the staff to see that.” And: “But I get up every morning. It’s a heavy burden.”