1998 In 1998, Biggert narrowly defeated (45%-40%) conservative state Senator
Peter Roskam in the Republican primary, the real contest in this ancestrally Republican district. In the general she earned 61% of the vote to win the seat opened up by the retirement of U. S. Representative
Harris Fawell. In 2006, Roskam was elected to Congress from another district.
2006 In 2006, Biggert's share of the vote in the general election fell below 60% (58%) for the first time in her Congressional career.
2008 In 2008, Biggert received less than 54% of the vote overall (and less than 50% of the vote in
Will County) in winning reelection to her sixth term in Congress. For the first time, she faced a financially competitive Democratic opponent, businessman Scott Harper, the first reasonably well-financed Democrat to run in the district or its predecessors in decades. In 2008, Democratic U.S. Sen.
Dick Durbin was reelected with 60% of the vote and Democrat
Barack Obama won 54% of the vote in the 13th Congressional District,
2010 Biggert won re-election.
2012 In the redistricting following the 2010 census, the Democratic-controlled state legislature significantly altered Illinois's congressional map, splitting Biggert's district. Her district was renumbered as the 11th District, and made significantly more Democratic even though it contains 50 percent of Biggert's former territory. A portion of her former district that included Biggert's home in
Hinsdale was combined with the heavily Democratic Chicago North Side-based 5th District. Biggert opted to run in the new 11th against the Democratic nominee, former 14th District Congressman
Bill Foster. ==Electoral history==