Democrats routinely dominate politics in the district, with the main focus of competition being the party primary. Only twice since 1966 has a Republican candidate for Congress received over 20% of the vote, and the Democratic nominee has topped 80% in every presidential race during that time. The district's expansion into the suburbs in the 1990s has incorporated a population that has voted Republican more often; Republican support has passed the 10% mark, and George W. Bush received 17% of the vote here in 2004. His was the best showing by a Republican presidential candidate in the district in over 40 years.