How Many Democrats Have Served As President?

Democrats are the politicians that belong to the Democratic party of the United States. So far there have been 13 people from Democratic party who have served as President of United States. However, some of them served for more than one term. So the total number of times for which a democrat has been elected as President is 20. The names of the Democratic Presidents are :

Andrew Jackson
Martin Van Buren
James Knox Polk
Franklin Pierce
James Buchanan
Grover Cleveland- Served for two terms
Woodrow
Wilson
Franklin Delano Roosevelt - Served three terms
Harry S. Truman
John Fitzgerald Kennedy
Lyndon Baines Johnson - Also served half of Kennedy's term
James Earl Carter
William Jefferson Clinton