Some Democrats and political commentators asserted that Coleman no longer had a serious chance of prevailing in the election, and that he continued to file appeals for the sole purpose of delaying the seating of a 60th member of the Democratic caucus in the U.S. Senate (after Pennsylvania Senator Arlen Specter changed his party affiliation from Republican to Democratic on April 28). (Sixty Senators would bring the Democrats to a level where they would not need any Republican votes to overcome a Republican filibuster in the Senate for the balance of the Senate term). Coleman disputed that allegation. About 60% of Minnesotans (64–28, 59–34, 63–37 in three polls) said they wanted Coleman to withdraw.