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CHICAGO — Venture capitalist Bruce Rauner won the GOP primary Tuesday in his bid for Illinois governor, as voters embraced a first campaign by the multimillionaire who flooded the airwaves with vows to run the Democratic stronghold like a business and curb the influence of government unions.
Republicans consider it their best shot in years to win the top job in President Obama’s home state. Rauner defeated three longtime state lawmakers including the state treasurer. He advances to a November matchup with Governor Pat Quinn, a Democrat who easily won his nomination.
‘‘The voters are going to face a stark choice in November, a major decision,’’ Rauner said in his victory speech. ‘‘It’s a choice between failure of the past and a new day.’’