DES MOINES, Iowa (AP) - Democrats are preparing for what could be their most contentious debate yet as the leading candidates gather in Iowa tonight looking for a way to break out of the crowded top tier less than three weeks before the state's caucuses kick-start the presidential nomination process.

Some of the fiercest clashes could center on Sens. Bernie Sanders of Vermont and Elizabeth Warren of Massachusetts, fellow progressives who until now have largely avoided criticizing each other.

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