These long time incumbents saw there vote decline by more than 5% vs. 2002 and received less than 65% of the vote, though they still won by over 20%. The result of their decline may be because or a strong opponent, a mini scandal, or a reflection of a slowly changing district demographic. This list also does not include candidates who did not face a major party opponent in 2002.
Republicans
The first number is the 2004 % of vote the congressperson received, the second is the 2002 number.
In no order
1.Ohio 14, Steve La Tourette, 62.7%, 72.1%
2.Ohio 15, Deborah Pryce, 60.0%, 66.5%
3.Michigan 8, Mike Rogers, 61.1%, 67.9%
4.Colorado 6, Tom Tancredo, 59.5%, 66.9%
5.Virginia 10, Frank Wolf, 63.8%, 71.7%
6.Texas 21, Lamar Smith, 61.5%, 72.8% (not sure what impact redistricting had here)
7.California 50, Randy 'Duke' Cunningham, 58.5%, 64.3%
8.New York 3, Peter King, 63.0%, 71.9%
9.Minnesota 3, Jim Ramstad, 64.6%, 72.0%
Democrats
1.Florida 2, Allen Boyd, 61.6%, 66.9%
2.Ohio 10, Dennis Kucinich, 60.0%, 74.1%
3.Hawaii 1, Neil Abercrombie, 63.0%, 68.6%
4.Virginia 9, Rick Boucher, 59.3%, 65.8%
5.Mississippi 4, Gene Taylor, 64.5%, 75.2%