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Republican presidential candidate Ben Carson delivers a speech to supporters Tuesday, Aug. 18, 2015, in Phoenix. The state Republican Party said Tuesday evening's rally was moved from a church in Tempe to the convention center because of high demand. (AP Photo/Ross D. Franklin)
Republican presidential candidate Ben Carson delivers a speech to supporters Tuesday, Aug. 18, 2015, in Phoenix. The state Republican Party said Tuesday evening's rally was moved from a church in Tempe to the convention center because of high demand. (AP Photo/Ross D. Franklin)

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    The quiet candidate gains on Trump

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The quiet candidate gains on Trump

Dr. Ben Carson is back on the campaign trail after a week off, and find himself second in the polls to the Republican frontrunner, Donald Trump. CNN's Dana Bash reports.

The quiet candidate gains on Trump

Dr. Ben Carson is back on the campaign trail after a week off, and find himself second in the polls to the Republican frontrunner, Donald Trump. CNN's Dana Bash reports.