No Right to Vote--Especially in Iowa
Legally the issue falls into a murky area. The Constitution promises no affirmative right to vote, just assurances that specific categories of people cannot be excluded. And because the parties do not collect demographic data, no one really knows who does and does not participate. Besides, since the caucuses are run not by government but instead privately by the parties, the courts are reluctant to intervene in all but the most egregious cases.
Read more about FairVote's proposal to establish a constitutionally protected right to vote here.