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"early start" continues right now. >> a big shakeup in the polls one day before the cnn republican presidential debate. which candidate is now becoming the focus of his competitors. president obama trying to reassure the public in the war against isis. meeting with military leaders this morning. good morning. welcome to "early start." i'm christine romans. >> i'm alison kosik. it is monday, december 14th. count them. nine candidates in las vegas tomorrow for the fifth republican debate here on cnn. it's the last debate of the year with only 48 days left until voting begins at the iowa caucus. the focus on national security after the san bernardino and paris terror attacks. we have cnn's athena jones in