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A new Quinnipiac poll shows Hillary Clinton winning a clean sweep of the highest-income slice of voters, highlighting the Democrats’ growing dominance among the nation’s wealthy and well-connected.

The new poll, released Tuesday, shows potential 2016 presidential candidate Hillary Clinton is backed by 45 percent of likely voters who earn more than $100,000, while New Jersey Gov. Chris Christie got 43 percent of the same group’s vote.

But Christie edged the former secretary of state 44 to 43 percent among middle-income voters who earn between $50,000 and $100,000, suggesting that the GOP’s strongest support lies in middle-class voters instead of the country-club set.