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those tests will be carried out in not only connecticut but also colorado, georgia and minnesota. we have a preview. >> reporter: it's august, and already the race to november is heating up. first key primaries. some even pitting support from party heavy hitters on opposite sides. in colorado, it's obama versus clinton. >> hi, this is bill clinton. i'm supporting andrew romanoff for the u.s. senate. >> reporter: obama backs michael bennet. a loss for bennet could be an embarrassment for obama. >> oh, my gosh. >> reporter: it's a political smackdown in connecticut. >> i approve this...

obama's political muscle going into the november elections. those tests will be carried out in not only connecticut but also colorado, georgia and minnesota. we have a preview. >> reporter: it's august, and already the race to november is heating up. first key primaries. some even pitting support from party heavy hitters on opposite sides. in colorado, it's obama versus clinton. >> hi, this is bill clinton. i'm supporting andrew romanoff for the u.s. senate. >> reporter: obama backs michael bennet. a loss for bennet could be an embarrassment for obama. >> oh, my gosh. >> reporter: it...