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Republican presidential campaigns and outside groups supporting them have spent nearly $8 million in TV advertisements so far ahead of next week’s first GOP debate — which is restricted to the candidates in the Top 10 of the national polls.

The biggest spenders, according to the ad-buying data from SMG Delta: 1) A non-profit backing Marco Rubio called Conservative Solutions Project (which doesn’t have to disclose its donors); and 2) A group supporting John Kasich.

By comparison, only about $1 million was spent at this point in the GOP presidential contest, per SMG Delta.

The only Democratic entity that has been spending money on a presidential candidate is the Super PAC supporting Martin O’Malley — and it’s just $25,000.

The GOP TV ad spending