On November 21, Obama announced that Oprah Winfrey would be campaigning for him in the early primary states, setting off speculation that, although celebrity endorsements typically have little effect on voter opinions, Winfrey's participation would supply Obama with a large, receptive audience. As word spread that Oprah's first appearance would be in Iowa, polls released in early December revealed that Obama had taken the lead in that decisive state. Then, on December 8, Oprah kicked off a three-state tour supporting Obama's campaign, where she drew record-setting crowds in Iowa, New Hampshire, and South Carolina, and was described as "more cogent, more effective, more convincing" than anyone on the campaign trail. The Oprah-Obama tour dominated political news headlines and cast doubts over Clinton's ability to recover her recently-lost lead in Iowa caucus polls. A poll released less than two weeks after Winfrey campaigned found that Obama had achieved more popularity in Iowa than ever recorded before.