The Republican National Committee logo is shown on the stage as crew members work at the North Charleston Coliseum, Jan. 13, 2016, in North Charleston, S.C. Republican presidential candidates will be blocked from the debate stage this summer if they do not sign a pledge to support the GOP's ultimate presidential nominee, according to draft language set to be adopted when the Republican National Committee meets next week. (AP Photo/Rainier Ehrhardt, File)
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