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Hillary Clinton and her allies are outspending Donald Trump and the groups supporting him over the airwaves by a whopping 15-to-1 margin, according to ad-spending data from SMG Delta.

Team Clinton has spent $45 million on ads so far in the general election, with $19 million coming from the campaign and another $26 million from the pro-Clinton Super PAC Priorities USA.

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That's compared with nearly $3 million for Team Trump -- with $1.5 million coming from the National Rifle Association and $1.3 million from the Super PAC Rebuilding America Now.

The Trump campaign itself has yet to spend a single cent on a TV or radio ad in the general election.

This ad-spending disparity is even wider in the battleground states, given that Rebuilding America Now's $1.3 million has been on cable TV, not in the battlegrounds.

Total Ad Spending To Date

Team Clinton: $45 million ($26 million from Priorities USA, $19 million from campaign)

Team Trump: $2.8 million ($1.5 million from NRA, $1.3 million from Rebuilding America Now).