The robust fundraising is due to huge donations from Clinton supporters such as hedge fund founder S. Donald Sussman, who has given the group $11 million in all. In an interview, Sussman called the former secretary of state “probably the most capable and smartest person to run for the presidency.”

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“I am motivated to having very smart people put in charge of my business and my government,” he added.

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Meanwhile, two of the main pro-Trump groups, Make America Number 1 and Great America PAC, together just pulled in $4.4 million last month. Nearly half the money came from conservative hedge fund magnate Robert Mercer, who gave $2 million.

A third group backing the GOP presidential nominee appears to be doing better since it received the campaign’s blessing last month. Rebuilding America Now, which files on a quarterly basis, reported raising $2.16 million through the end of June, but has spent $11.4 million on anti-Clinton and pro-Trump ads through Friday, FEC filings show. Both Trump and his running mate, Indiana Gov. Mike Pence, have expressed willingness to headline fundraisers for the super PAC.

Still, the pro-Trump groups still lag far behind their Clinton counterparts — a reflection of the reluctance of many GOP heavyweight donors to put their resources behind Trump.

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That has led to a major imbalance on the airwaves. So far, pro-Clinton and anti-Trump groups have reported spending more than $113 million on voter contact in 2016 – compared to $36 million to boost Trump and go after Clinton, filings show. (That includes money spent during the primaries.)

The main driver for Clinton has been Priorities, which has already reported spending $48 million on ads. From August until election day, the super PAC had roughly $87 million in TV airtime reserved, along with $5 million for radio and tens of millions in digital ads.

The group has been fueled with seven-figure checks from some of the wealthiest figures on the left, such as investor George Soros ($7 million) and Univision Chairman Haim Saban and his wife Cheryl ($10 million).

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In July, Sussman, who had already given the super PAC $8 million, doled out another $3 million. Slim-Fast founder Daniel Abraham also contributed $3 million, bringing his total contribution to $6 million.

The scenario is a dramatic flip from 2012, when Priorities initially struggled to persuade rich Democrats to support its efforts to reelect President Obama, while a super PAC supporting GOP nominee Mitt Romney vacuumed up cash.

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Other Democratic super PACs are also benefiting from the largesse from liberal donors and labor unions this year. Sussman gave another $1 million in July to House Majority PAC, which works to elect Democratic congressional candidates, bringing his total contributions to that group to $3 million.

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