Which of the remaining primaries are open ones where Santorum could appeal to Democrats to vote for him?
Open Contests
Alabama (50)
Arizona (Semi-closed, with primaries open only to unaffiliated or unrepresented voters, except for the Libertarian primary.)(57)
Arkansas (36)
Georgia (75)
Hawaii (Open primary for state, local, and congressional races; caucus system for presidential races.)(20)
Idaho (32)
Indiana (46)
Massachusetts (All races' primaries open for "unenrolled"/unaffiliated voters only)(41)
Michigan (59)
Mississippi (37)
Missouri (53)
South Carolina (50)
Tennessee (58)
Texas (152)
Vermont (17)
Virginia (49)
Wisconsin (42)