keynote speaker Harold Stassen, the Governor of Minnesota, announced his support for Willkie and became his official floor manager. Hundreds of vocal Willkie supporters packed the upper galleries of the convention hall. Willkie's amateur status and fresh face appealed to delegates as well as voters. Most of the delegations were selected not by primaries, but by party leaders in each state, and they had a keen sense of the fast-changing pulse of public opinion. Gallup found the same thing in polling data not reported until after the convention: Willkie had moved ahead among Republican voters by 44% to only 29% for the collapsing Dewey. As the pro-Willkie galleries chanted "We Want Willkie!" the delegates on the convention floor began their vote. Dewey led on the first ballot, but steadily lost strength thereafter. Both Taft and Willkie gained in strength on each ballot, and by the fourth ballot it was obvious that either Willkie or Taft would be the nominee. The key moments came when the delegations of large states such as Michigan, Pennsylvania, and New York left Dewey and Vandenberg and switched to Willkie, giving him the victory on the sixth ballot. Willkie's nomination was one of the most dramatic moments in any political convention. Having given little thought to whom he would select as his vice-presidential nominee, Willkie left the decision to convention chairman and Massachusetts Representative Joseph Martin, the House Minority Leader, who suggested Senate Minority Leader Charles L. McNary from Oregon. Despite the fact that McNary had spearheaded a "Stop Willkie" campaign late in the balloting, the convention picked him to be Willkie's running mate. General election Polling The Gallup Poll accurately predicted the election outcome. However, the American Institute of Public Opinion, responsible for the Gallup Poll, avoided predicting the outcome, citing a four percent margin of error. The Gallup Poll also found that, if there was no war in Europe, voters preferred Willkie over Roosevelt. Fall campaign Willkie crusaded against Roosevelt's attempt to break the two-term presidential tradition, arguing that "if one man is indispensable, then none of us is free." Even some Democrats who had supported Roosevelt in the past disapproved of his attempt to win a third term, and Willkie hoped to win their votes. Willkie also criticized what he claimed was the incompetence and waste in Roosevelt's New Deal welfare programs. He stated that as president he would keep most of Roosevelt's