Supermajority rule gave southern Democrats an effective veto over any presidential nominee for many years, until the rule's abolition at the 1936 Democratic National Convention. A majority vote, or more than half the votes cast, is a common voting basis. Instead of the basis of a majority, a supermajority can be specified using any fraction or percentage which is greater than one-half (i.e., 50%). It can also be called a qualified majority. Common supermajorities include three fifths (60%), two thirds (67%), and three quarters (75%). A two-thirds vote, when unqualified, means two-thirds or more of the votes cast. This voting basis
50 State Quarters of the coins." While mintage totals of the various designs vary widely—Virginia quarters are almost 20 times as abundant as the Northern Marianas quarters—none of the regular circulating issues are rare enough to become a valuable investment. There was, however, a measure of collector interest and controversy over die errors in the Wisconsin quarter. Some designs from the Denver mint feature corn without a smaller leaf, others feature a small leaf pointing upwards, and still others have the leaf bending down. A set of all three quarters sold on eBay in February 2005 for $300 and initially saw significant increases,