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A new national poll shows retired neurosurgeon Ben Carson surging among Republican primary voters, running nearly even with GOP frontrunner Donald Trump.

The new poll from CBS News and the New York Times shows that Carson's support has risen from just six percent last month to 23 percent now. Trump still leads the pack at 27 percent, while no other candidate receives double-digit backing.

Carson's rise has come amid a significant slide for two other Republicans: former Florida governor Jeb Bush and Wisconsin Gov. Scott Walker.

Bush, who garnered 13 percent of GOP primary voters in the same poll last month, is down to six percent. Walker has slid from 10 percent support to just two percent in the new poll.

Tied for third place with Bush at six percent are former Arkansas governor Mike Huckabee and Florida senator Marco Rubio. Texas Sen. Ted Cruz gets five percent; former HP chief Carly Fiorina has four percent support; and Ohio Gov. John Kasich and Kentucky Sen. Rand Paul each get the backing of three percent of GOP primary voters.

All other candidates received less than three percent support.

The poll was conducted September 9-13 and has a margin of error of +/- three percent.