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Trump, Carson alone in GOP’s top tier

Much of the Republican establishment looked forward to the end of August — but September isn't shaping up any better for party officials.

Republican 2016 presidential candidates pose at the start of the first official Republican presidential candidates debate of the 2016 U.S. presidential campaign in Cleveland
Republican 2016 presidential candidates (L-R), U.S. Senator Marco Rubio, Dr. Ben Carson, Wisconsin Governor Scott Walker, businessman Donald Trump, former Florida Governor Jeb Bush and former Arkansas Governor Mike Huckabee, pose together at the start of the first official Republican presidential candidates debate of the 2016 U.S. presidential campaign in Cleveland, Ohio, Aug. 6, 2015.REUTERS

Steve Benen is a producer for "The Rachel Maddow Show," the editor of MaddowBlog and an MS NOW political contributor. He's also the bestselling author of "Ministry of Truth: Democracy, Reality, and the Republicans' War on the Recent Past."