None of those initiatives would have passed under a ballot measure getting decided by voters Tuesday. In most of those states, a simple majority of voters is all that's needed to approve constitutional amendments. Advertisement AdvertisementMissouri's proposal would apply only to citizen initiatives. A new petition could fortify citizen initiativesRegardless of the outcome, Tuesday's vote may not be the last on Missouri's citizen initiatives. Supporters insist their measure is nonpartisan, noting that Democratic lawmakers also tried to restrict citizen initiatives before Republicans gained control of the Capitol.