<P> In 2011, the state adopted a "modified open primary". Individual citizens may vote for any candidate, and the top two candidates regardless of party will advance to the general election . The Presidential election is exempt from this voting method as it is a contest for delegates rather than a direct election for an office . </P> <P> A potential side effect of the open primary is that parties that run more candidates may find themselves at a disadvantage, since their partisan supporters' votes will be split more ways in the primary and thus those candidates may have a harder time reaching the top - two ranking when competing with parties that run fewer candidates . </P> <Ul> <Li> Alabama </Li> <Li> Arkansas </Li> <Li> Colorado </Li> <Li> Georgia </Li> <Li> Illinois </Li> <Li> Indiana </Li> <Li> Massachusetts (All races' primaries open for "unenrolled" / unaffiliated voters only) </Li> <Li> Michigan </Li> <Li> Mississippi </Li> <Li> Missouri </Li> <Li> Montana </Li> <Li> New Hampshire </Li> <Li> North Carolina (All races' primaries open for unaffiliated voters only) </Li> <Li> North Dakota </Li> <Li> Ohio </Li> <Li> Oklahoma (Only Democratic primary is open to Independent voters as of November 2015) </Li> <Li> Rhode Island </Li> <Li> South Carolina </Li> <Li> Tennessee </Li> <Li> Texas </Li> <Li> Vermont </Li> <Li> Virginia </Li> <Li> Wisconsin </Li> </Ul> <Li> Massachusetts (All races' primaries open for "unenrolled" / unaffiliated voters only) </Li>

Who are you allowed to vote for in a state presidential primary