Thursday may be a telling day for presidential candidate Barack Obama. After dropping by "The View," he'll be staging a free rally in Washington Square Park that organizers are reportedly hoping will top large outdoor rallies in other cities. The size of the crowd should be a good indication of his popularity amidst growing sentinement that his Democratic rival Hillary Clinton has all but sewn up the nomination. If he can draw a massive crowd of supporters in Clinton's backyard, would that start to turn the tide? And if he can't, is it a sign that his interest in his campaign in waning?