McPhillips received a large amount of support in the southern part of the state, but Parker won the most votes. Sowell endorsed Parker for the run-off.
Alaska
Incumbent Ted Stevens ran for and won a seventh term. He faced perennial candidate Frank Vondersaar, the Democratic nominee, journalist Jim Sykes, the Green Party nominee, and several other independent candidates in his bid for re-election. Ultimately, Stevens crushed his opponents to win what would be his last term in the Senate, allowing him to win with the largest margin of victory for any Senate election in Alaska, as well as the highest percentage of the vote in any of his elections.
Arkansas
Incumbent Republican Tim Hutchinson ran for a second term, but lost re-election to Arkansas Attorney General Mark Pryor.
thumb|75px|Republican State Representative [[Jim Bob Duggar challenged incumbent Tim Hutchinson in the primary.]]
Colorado
Incumbent Republican Wayne Allard won re-election to a second term over former U.S. Attorney Tom Strickland.