Jimmy Hoffa IBT would expand as the union itself grew. Hoffa worked to defend the Teamsters unions from raids by other unions, including the CIO, and extended the Teamsters' influence in the Midwestern states, from the late 1930s to the late 1940s. Although he never actually worked as a truck driver, he became president of Local 299 in December 1946. He then rose to lead the combined group of Detroit-area locals shortly afterwards, and advanced to become head of the Michigan Teamsters groups sometime later. During this time, Hoffa obtained a deferment from military service in World War II by successfully making
James P. Hoffa pension, health and welfare benefits. "We…have negotiated an agreement that will greatly benefit our members at U.P.S. as well as Teamster members in other industries covered by pension and health and welfare funds." Teamster freight members ratified a new, National Master Freight Agreement (NMFA) in February, 2008. Covering 60,000 workers at YRC Worldwide, Yellow Transportation, Roadway and regional units at USF Holland and New Penn Motor Express. On February 20, 2008, Hoffa became the first major union leader to endorse Senator Barack Obama (D-IL) in his bid for President of the United States. Hoffa campaigned in major states for Obama