Carson signals exit, U.S. Republicans grapple with Trump victories

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