| President Republican - District 21 | 100.% ( 414 of 414 ) precincts reporting as of Mar 4, 2008, at 9:49 a.m. County Returns Other Contests | | Districtwide Results | |
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| | Mike Huckabee (Rep) | 10,183 | 16.0 % |   |
| | Duncan Hunter (Rep) | 125 | 0.1 % |   |
| | Alan Keyes (Rep) | 299 | 0.5 % |   |
| | Sam Brownback (Rep) | 44 | 0.0 % |   |
| | John H. Cox (Rep) | 57 | 0.0 % |   |
| | Rudy Giuliani (Rep) | 3,249 | 5.2 % |   |
| | John McCain (Rep) | 22,958 | 36.1 % |   |
| | Ron Paul (Rep) | 1,767 | 2.8 % |   |
| | Mitt Romney (Rep) | 23,489 | 37.0 % |   |
| | Tom Tancredo (Rep) | 33 | 0.0 % |   |
| | Fred Thompson (Rep) | 1,443 | 2.3 % |   |
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