Hillary Clinton leads Barack Obama 57% to 37% in Pennsylvania. Last week, the American Research Group's poll found Clinton and Obama in a tie. Despite Obama's numbers coming out of Pennsylvania, he continues to lead nationally. A Gallup poll today finds Obama leading Clinton 50% to 40%.
UPDATE: The Wall Street Journal's Carl Bialik questions the accuracy of ARG's poll numbers.
"But there are reasons to question ARG polling numbers. In a polling report card of 2008 primary accuracy issued by a rival survey company, ARG ranked in the bottom half of more than three dozen polling firms, among 2008 primaries through late February. It also ranked near the bottom in another ranking of pollster accuracy at fivethirtyeight.com, a Web site that tracks the Electoral College. And, as I wrote last month, the widely tracked polling averages at the political Web site Real Clear Politics don’t include ARG numbers, because of concerns about transparency. Like they’ve been in Pennsylvania, ARG polls also were volatile in previous primaries, notably in Wisconsin, which saw a 16-point swing in just two days."
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