Very enlightening when you look at this:
Oil & Gas:
Top 20 Recipients 
Election cycle:  2006 2004 2002 2000 1998 1996 1994 1992 1990 
List Top 20:   All Recipients Presidential Candidates Senators Members of the House Senate Candidates House Candidates All Members of Congress 
Rank
 Candidate
 Office
 Amount
 
1
 Cornyn, John (R-TX) 
 Senate
 $511,825
 
2
 Inhofe, James M (R-OK) 
 Senate
 $241,258
 
3
 Landrieu, Mary L (D-LA) 
 Senate
 $221,405
 
4
 Allard, Wayne (R-CO) 
 Senate
 $174,100
 
5
 Domenici, Pete V (R-NM) 
 Senate
 $164,658
 
6
 Hutchinson, Tim (R-AR) 
 Senate
 $154,130
 
7
 Sununu, John E (R-NH) 
 Senate
 $137,380
 
8
 Coleman, Norm (R-MN) 
 Senate
 $136,400
 
9
 Thune, John (R-SD) 
 Senate
 $134,650
 
10
 Talent, James M (R-MO) 
 Senate
 $130,450
 
11
 Dole, Elizabeth (R-NC) 
 Senate
 $127,229
 
12
 Sullivan, John (R-OK) 
 House
 $124,100
 
13
 Young, Don (R-AK) 
 House
 $121,950
 
14
 Tauzin, Billy (R-LA) 
 House
 $121,750
 
15
 Barton, Joe (R-TX) 
 House
 $120,898
 
16
 Pickering, Charles "Chip" Jr (R-MS) 
 House
 $101,350
 
17
 Stevens, Ted (R-AK) 
 Senate
 $100,690
 
18
 Pearce, Steve (R-NM) 
 House
 $100,200
 
19
 Bonilla, Henry (R-TX) 
 House
 $98,950
 
20
 DeLay, Tom (R-TX) 
 House
 $92,800
Just follow the money in these things-easy2