As the presidential race heats up, vice-presidential expert Joel Goldstein discusses how the role of the nation's No. 2 has changed over the decades.
Former President Grover Cleveland – a Democrat – is making a comeback among conservatives for his strict limits on government spending. But Cleveland's principles make for bad politics, which is why there will probably never be another president like him.
Even while leading the nation, these American presidents found time to write their valentines poems and love letters.
Test your knowledge. Can you answer these questions about the presidents of the United States?