So basically if a district splits 60%-20%-20%, its delegates are split evenly. What a dumb system.
Actually, no...
If one candidate gets a two-thirds majority or is the only candidate to break 20%, that candidate gets all 3 delegates:
Examples: Santorum wins 3 delegates
Santorum 69% 40%
Romney 22% 19%
Gingrich 4% 19%
Paul 5% 19%
Other 0% 3%
If two or more candidates get over 20%, the winner gets two delegates, second place gets 1 and the rest get zero.
Examples: Santorum 2; Romney 1
Santorum 65% 40%
Romney 21% 30%
Gingrich 9% 25%
Paul 5% 5%
Otherwise, the top three finishers get 1 each:
Examples: Santorum 1; Romney 1; Gingrich 1
Santorum 19%
Romney 18%
Gingrich 18%
Paul 16%
Perry 15%
Bachman 14%