Ben Carson tells supporters no 'path forward' in presidential bid
Ben Carson soared to the top of the 2016 Republican presidential heap with an inspiring story about his rise from a difficult childhood in Detroit to a successful career as a neurosurgeon (AFP Photo/Paul J. Richards)

Republican presidential candidate Ben Carson said on Wednesday that he does not see a "political path forward" in his 2016 bid for the White House.

Carson, a retired neurosurgeon who has not yet won a state contest of the more than a dozen held so far, said he will not attend Thursday's Republican debate in Detroit.

He has not formally suspended his campaign.

(Reporting by Megan Cassella; editing by Tim Ahmann)