In 1972, after selling his bank for millions, Stark challenged 14-term Rep. George Miller (not to be confused with another former California Democratic congressman with the same name) in the primary. Stark, who was 41 at the time, contrasted himself with the 81-year-old incumbent and portrayed himself as the anti-war candidate. Stark won by a lopsided 56-21 margin, and he went on to prevail in the general election 53-47.
While Stark was an influential member of Congress during his 40 years in office, he also became infamous for his temper and insults. Among many other things, Stark said that Health and Human Services Secretary Louis Sullivan, who was a black doctor, was “as close to being a disgrace to his race as anyone I've ever seen,” called a GOP congresswoman a “whore for the insurance industry,” and said in 2007 that House Republicans wanted to send young people to Iraq “to get their heads blown off for the president’s amusement.” In 2010, Stark’s behavior likely cost him the chance to chair the powerful Ways and Means Committee.
Stark never faced a close election during all of this time in his seat, but that changed in 2012. California’s independent redistricting committee gave Stark a seat, now numbered the 15th District, that included a little less than half of the constituency that he’d represented over the prior decade and included more Republicans and independents. That may not have been a problem if Stark got to keep competing in party primaries, but the state’s new top-two system further complicated his re-election prospects.
Most Democrats were content to wait for Stark to retire, but Eric Swalwell, a little-known member of the Dublin City Council and an Alameda County prosecutor, decided to take his chances and challenge the 81-year-old incumbent. Stark quickly drew negative headlines on the campaign trail when he accused Swalwell of taking bribes without providing a shred of evidence and labeled him a “fucking crook.” The two each advanced to the general election, and in a contest where more and more stories about Stark’s behavior kept surfacing, Swalwell won 52-48.