Chester Arthur
James A. Garfield
Bureaucrats are responsible to many people including the president, Congress, and the voters. So, this would be pretty much everyone.
The president of the Second Continental Congress was Peyton Randolph.George Washington
Here are a few, I am sure there are more. Congress enacts the laws the president has to enforce. This means the president is limited to acts within the scope of power that Congress gives him unless the Constitution gives the president a power that cannot be regulated this way. Congress passes the law that adopts the federal budget. This means that the president can only do as much as the Congress will let him pay for. Congress can impeach a president and then turn him out of office for what the Constitution calls "high crimes and misdemeanors." This ensures that the President follows the laws like everyone else has to. There are many more examples.
No one: Everyone is dead. The question originally asked who becomes President if the President dies (the Vice President), and who becomes President if he subsequently dies (Speaker of the House), and so on (President pro tempore, then Secretary of State, other Cabinet secretaries, members of Congress, etc.). The complete Presidential line of succession is at the related link.
The fact that Truman won surprised most experts.
She gave presents to everyone.
It didn't take much after the attack of Pearl Harbor. Everyone was ready to fight.
Everyone is surprised when Otis Amber testifies in "Murder on the Orient Express" because he was not expected to be involved in the case or have relevant information. His sudden appearance and testimony catch everyone off guard, adding a new twist to the investigation.
no
Everyone who is not the President of anywhere
No, it is open to everyone.