§ Ind. Code § 3-10-1-6Eligible voters

A voter may vote at a primary election:
(1) if the voter, at the last general election, voted for a majority of the regular nominees
of the political party holding the primary election; or
(2) if the voter did not vote at the last general election, but intends to vote at the next
general election for a majority of the regular nominees of the political party holding the
primary election;
as long as the voter was registered as a voter at the last general election or has registered
since then.