A Democrat before seeking elective office , Bloomberg switched his party registration in 2001 to run for mayor as a Republican .
Bloomberg has served as the 108th Mayor of New York City , holding office for three consecutive terms , beginning with his first election in 2001 .
A Democrat before seeking elective office , Bloomberg switched Bloomberg 's party registration in 2001 to run for mayor as a Republican .
Bloomberg has served as the 108th Mayor of New York City , holding office for three consecutive terms , beginning with his first election in 2001 .