Voters in 10 states will go to the polls Tuesday, with more than 400 delegates up for grabs. Oklahoma represents 10 percent of the available delegates. Here's how the primary process works in Oklahoma, what's at stake and the state of the Republican race.
* Oklahoma has 43 delegates to the Republican National Convention. Each of the five congressional districts has three delegates. Of the remaining delegates, 25 are at-large and three are party leaders.
* If a candidate receives more than 50 percent of the vote in a district or only one candidate tallies more than 15 percent, that candidate receives all three delegates. If more than one candidate totals more than 15 percent, the candidate with the highest vote total receives two delegates and the other receives one. If none of these conditions is met, the three candidates with the highest totals each receive one delegate.
* At-large delegates are assigned according to the statewide totals. If one candidate receives more than 50 percent of the statewide vote, he receives all of the delegates. Otherwise, they are assigned proportionally to candidates who received at least 15 percent of the statewide vote.
* The three party leaders are unpledged and can vote however they want.
* Oklahoma utilizes a closed primary system. To vote, the voter must be a registered member of that party.
* Seven of the eight Republican candidates will appear on the primary ballot. The exception is Herman Cain. Only Mitt Romney, Rick Santorum, Newt Gingrich and Ron Paul are still actively running for president.
* Santorum is polling well in the state. According to polling data gathered by Real Clear Politics, Santorum has an average lead of more than 20 points over Gingrich and Romney. The most recent poll by Rasmussen, taken late last month, puts Santorum at 43 percent, Gingrich at 22 percent, Romney at 18 percent and Ron Paul at 7 percent.
* A poll released Saturday by American Research Group, not included in the Real Clear Politics numbers, shows Santorum at 36 percent, Romney at 26 percent, Gingrich at 22 percent and Paul at 9 percent.
- Republican National Convention
- Rick Santorum
- Mitt Romney
- Newt Gingrich