How many times did Theodore Roosevelt run for president (and how many terms did he serve)?

Theodore Roosevelt campaigned for election to the office
of the presidency two times. He was elected as vice-president when William McKinley was
elected as president in the 1900 election. At that time, terms for president and
vice-president began in March, not Jan. 20 as is now the practice. Pres. McKinley was
assassinated and Pres. Roosevelt was sworn into office on Sept. 14, 1901, so he didn't
actually run for the presidency prior to his first term in office. He did run for
reelection in 1904 and won easily.

Roosevelt endorsed Taft
for the presidency in the 1908 election but was dismayed with the direction in which
Pres. Taft took the government. Roosevelt was unable to regain the Republican nomination
for the presidency as the 1912 campaign approached, so he and his followers formed a
third political party, popularly known as the Bull Moose Party, and Roosevelt campaigned
for election under that party's sponsorship. He lost the election to Woodrow Wilson, but
did gain more of the popular vote than did Pres. Taft.