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SAN FRANCISCO, CA - JULY 16: Republican presidential candidate and former Florida governor Jeb Bush speaks to workers at Thumbtack on July 16, 2015 in San Francisco, California. Republican presidential hopeful Jeb Bush toured Thumbtack, a consumer service company for hiring local professionals. (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO, CA - JULY 16: Republican presidential candidate and former Florida governor Jeb Bush speaks to workers at Thumbtack on July 16, 2015 in San Francisco, California. Republican presidential hopeful Jeb Bush toured Thumbtack, a consumer service company for hiring local professionals. (Photo by Justin Sullivan/Getty Images)

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    Is Jeb Bush losing ground in the race to the White House?

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Is Jeb Bush losing ground in the race to the White House?

Former Florida Governor and Republican presidential candidate Jeb Bush falls behind Donald Trump in the polls. CNN's Jeff Zeleny reports on Bush's campaign.

Is Jeb Bush losing ground in the race to the White House?

Former Florida Governor and Republican presidential candidate Jeb Bush falls behind Donald Trump in the polls. CNN's Jeff Zeleny reports on Bush's campaign.