A super PAC backing Republican presidential hopeful Rand Paul accelerated its fundraising in the second half of 2015, a period in which the Kentucky senator has failed to break out in the crowded field of candidates.

The group, Concerned American Voters, raised $3.2 million in the last six months, up from $1.8 million in the first half of the year, according to a spokesman. The super PAC has more than $2 million in the bank, the spokesman said.

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