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Out of the approximately $150 million spent on advertisements in the 2016 presidential race, nearly 70 percent of it has come from outside groups, according to ad-tracking data from NBC News partner SMG Delta.

But there is a significant difference by party: 83 percent of the Republican ad dollars, especially in early states like Iowa and New Hampshire, have come from Super PACs and other outside groups, versus just a mere 2 percent from Democrats.

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Another way to view it: Campaigns are responsible for 98 percent of the more than $25 million spent on ads in the Democratic race ($24.8 million out of $25.2 million), compared with just 17 percent on the Republican side ($21.3 million out of $123.7 million).

One of the biggest reasons for that difference has been the pro-Jeb Bush Super PAC, Right to Rise – the biggest advertiser in the 2016 race – which has spent more than $50 million on TV ads, while the Bush campaign itself has spent just more than $2 million. That’s almost a 25-to-1 ratio.

Worth pointing out: Campaigns get discounted ad rates from TV stations, which mean that outside groups typically have to spend more – sometimes four times as much – to air the same television ad.

Biggest ad spenders to date

Team Bush: $52.8 million ($50.7M from Super PAC, $2.1M from campaign)

Team Rubio: $29.8 million ($10.6M from campaign, $9.6M from Super PAC, $9.6M from 501c4)

Team Clinton: $14.6 million ($14.4M from campaign, $199K from Super PAC)

Team Kasich: $10.6 million (all from outside groups, except $289K from campaign)

Team Sanders: $10.3 million (all from campaign)

Team Christie: $9.9 million ($9.5M from Super PAC, $407K from campaign)

Team Carson: $4.3 million ($4.1M from campaign, $200K from Super PAC)

Team Cruz: $2.8 million ($1.4M from campaign, rest from outside groups)

Team Trump: $2.2 million (all from campaign)

Team Paul: $1.1 million ($965K from Super PAC, $125K from campaign)

Team Fiorina: $1.0 million (all from Super PAC)

SOURCE: NBC/SMG Delta