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LAS VEGAS — Nothing that happened during the undercard debate Tuesday evening will change the trajectory of the Republican primary campaign. But that doesn't mean nothing significant happened.

The four underdog candidates that participated — Sen. Lindsey Graham of South Carolina, former Arkansas Gov. Mike Huckabee, former Pennsylvania Sen. Rick Santorum and former New York Gov. George Pataki — remain long shots for the GOP's 2016 crown. But the CNN cablecast revealed the extent that front-runner Donald Trump is dominating the media environment that has gone a long way toward shaping the campaign.

Graham declined to complain about the questioning after the debate, saying he believed the debate was productive because it focused on national security. "This was the best debate," he said. "This was a debate about, what we would do as commander-in-chief."

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