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Ted Cruz Refuses To Endorse Fellow Republican Senator From Texas

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AP Photo / Charles Dharapak

Speaking at a Politico Playbook event in Washington, the conservative firebrand noted that incumbents carry great advantages over challengers, suggesting Cornyn didn't need any help. Asked by Mike Allen again if he would vote for Cornyn, Cruz said the matter was "between me and the ballot box."

Cruz was caught fundraising for the Madison Project on Wednesday, a tea party group that openly opposes Republican leadership and backs challenges to incumbent senators.