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Sanders poised for Wisconsin win over Clinton

| Bernie Sanders is trying to keep his momentum going heading into Tuesday's Wisconsin primary, where 86 Democratic delegates are up for grabs. Most of its voters are white, with a high number of young people. That's good for Sanders, who has a narrow lead in our CBS News battleground tracker. Hillary Clinton's campaign manager is looking ahead, saying in a memo that her overall lead will be hard to beat. Nancy Cordes reports.