Retired neurosurgeon Ben Carson signaled on Wednesday he was quitting the Republican presidential race, leaving three candidates facing Donald Trump as the party establishment struggled to find a way to halt the outspoken businessman. Carson, a conservative who briefly led opinion polls among Republicans earlier in the campaign, said he did not “see a political path forward” after performing poorly in this week's Super Tuesday nominating contests. Despite a push by some mainstream Republicans to try to block Trump from winning the nomination, the billionaire industrialist Koch brothers will not deploy their $400 million political arsenal to attack him in the presidential primary campaign.
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Carson signals exit, U.S. Republicans grapple with Trump victories
