Mr. Foster won with 53percentt of the vote, while Mr. Oberweis had 47 percent, The Associated Press reported.
Foster won best actress at the Golden Globes in 2012 for Carnage and, the next year, won the Cecil B DeMille award for outstanding contribution to entertainment.
Foster won a full term in the general election in the following November, but he lost in 2010 to Republican Randy Hultgren, who also cruised to reelection on Tuesday.
Foster won the first race at London's Aquatics Centre, the venue for the 2012 Games, in an event which marked one year to go until the Olympics, but it was not enough to tempt him to make a full-time return to the pool.
The Rockaway Game was imported by such players into the N.B.A., where it helped foster a winning formula.
Most people think there will be no run-off, or that Mr Foster will win big if there is one.
But Foster had won at Vanderbilt with players who were tall and intellectual, and at St. Joseph's with solid and tough-minded ones.
Foster's win doubles the number of physicists in Congress, as Rush Holt, a plasma physicist and a Democrat from New Jersey's 12th district won his eighth term in the House.
Bridgitte Foster-Hylton won that 100m hurdles heat, by the way, and Brit Sarah Claxton has also progressed.
