By ALEXANDRA JAFFE, STEVE PEOPLES and DARLENE SUPERVILLE
Associated Press

DES MOINES, Iowa (AP) - Elizabeth Warren is standing behind her charge that Bernie Sanders said a woman could not defeat Donald Trump. She made an energetic case for a female nominee in a Tuesday night debate that raised gender as a core issue in the Democrats' sprint to the Iowa caucuses. Sanders firmly denied Warren's accusation and said it was “incomprehensible” to believe he would suggest a woman couldn't become the president. The Democratic Party’s leading presidential candidates also sparred over Iraq, war and foreign policy Tuesday night in the final debate showdown before primary voting begins.

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