Romney raked in more than $100 million, well above his goal for the month and a solid improvement over the $77 million banked in May.
Romney did particularly well in Colorado, Ohio, Michigan and New Jersey, Politico said, with a sizable chunk coming from first-time donors.
Politico said Romney outdistanced President Obama, who raised $60 million in June. The president, however, still holds the single-month record for any presidential candidate of $150 million set in September 2008.
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