Indiana Code Title 3. Elections § 3-9-5-2

(1) Candidates for state office and their candidate's committees.

(2) The following central committees:

(3) Other regular party committees that propose to influence the election of a candidate for state or legislative office or the outcome of a public question for or against which the electorate of the whole state may vote.

(4) Political action committees that propose to influence the election of a candidate for state or legislative office or the outcome of a public question for or against which the electorate of the whole state may vote.

(5) Legislative caucus committees.