6 seats: 4R, 2D    R 55

Colorado has been a safe haven for incumbents, who have won 42 of 43 races since 1982, but newcomer Mark Udall likely will face another stiff challenge in his evenly divided district. Fellow freshman Tom Tancredo has a more favorable district.

1. Diana DeGette (D), 1996 . Diana DeGette (D), 1996					Landslide
	'98: 67	'96: 57	['94: D 60	'92: D 69]		D 62
2. Mark Udall (D), 1998 . Mark Udall (D), 1998					Vulnerable
	'98: 50	['96: D 57	'94: D 57	'92: D 61]		50-50
3. Scott McInnis (R), 1992 . Scott McInnis (R), 1992					Landslide
	'98: 66	'96: 69	'94: 70	'92: 55		R 56
4. Bob Schaffer (R), 1996					Uncontested
	'98: 59	'96: 56	['94: R 72	'92: R 58]		R 58
5. Joel Hefley (R), 1986 . Joel Hefley (R), 1986					Uncontested
	'98: 73	'96: 72	'94: 100	'92: 71		R 66
6. Tom Tancredo (R), 1998 . Tom Tancredo (R), 1998					Win
	'98: 56	['96: R 62	'94: R 70	'92: R 61]		R 56