Arizona Senator John McCain wins handily in Wisconsin while showing stronger support among the Republican Party's base.

Self-identified Republicans made up more than 7 of 10 voters, and they went for McCain by 22 points - 58 percent to 36 percent for Huckabee.

Conservatives also went for McCain by 4 percentage points, and among those voters who consider themselves somewhat conservative McCain wins 55 percent to Huckabee's 38 percent.

McCain even wins among frequent conservative talk radio listeners. These voters make up 28 percent of primary participants, and they went for McCain over Huckabee by 20 points.

Again today, the retired naval aviator garners the support of veterans. Vets make up almost one quarter of voters, and they chose McCain over Huckabee by a significant 63 percent to 31 percent.

Voters also clearly think that McCain is the best Republican to defeat the Democratic nominee in November. A solid majority of more than 8 of 10 voters picked McCain.

These results are from the FOX News exit poll conducted Feb. 19, 2008, among 880 primary voters at 35 precinct locations. Voters were questioned as they exited their voting sites.