evidence: Amendments to the Constitution have required "equal protection," eliminated the poll tax, and made it unconstitutional to restrict voting based on race, sex, and age for those over 18. For years the Supreme Court relied on these amendments to expand the franchise, and the broadening of voting rights, which was associated with the civil-rights movement, was widely accepted as a marker of progress toward a just society until about 2000. More recently, in an environment of increasingly rigid partisan loyalties, controlling who votes offers more leverage than persuading voters to change their minds, and thus access to the ballot itself has become an arena of intense political conflict. These conflicts constitute what the election scholar Richard Hasen calls "the voting wars." Most of these wars end up in the courts, where the rules of engagement—defined by our Constitution—do not sufficiently protect voters’ rights to exercise their franchise. In the absence of an explicit right to vote, the Court has found no issue with a variety of regulations that unnecessarily interfere with voting.