head of state
Representative Government
The people that are in The West Wing serve the president.
Representative Government
John Quincy Adams, 1831-47
Yes, and it's even happened before. John Quincy Adams was a Congressman from Massachusetts after his term as President.
President Franklin Delano Roosevelt.
Not if they serve another country.
An example is when the American President is re-elected by the American voters to serve another term as President.
Kenneth Clark
8 years
The principles that made the problems of representative government be solved were those that made sure we had as little of it as possible. The Senators, who would serve the longest (six years) were to be appointed by the State legislatures, not the people. The President, who would serve four years, was to be elected by the Electoral College, not the people. And the Representatives, who would serve the least time of all (two years), they and only they would be directly elected by the people. And the Supreme Court who's members would serve for life? They were to be appointed by the unelected President and confirmed by the unelected Senate. Those were the Constitutional principles that solved the problems of representative government. (Note: It wasn't all bad. Only the directly elected representatives could vote for a new tax. And much later, an amendment would pass allowing for Senators to be directly elected. The President still is not.)