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Bernie Sanders' presidential campaign this week is outspending Hillary Clinton's in terms of political advertisements, according to ad-spending data from NBC News partner SMG Delta.

Sanders has spent a combined $900,000 over the airwaves in the early nominating states, while Clinton has spent slightly more than $750,000 in those same states. For the entire presidential race, Clinton has outspent Sanders over the airwaves, $13.8 million to $9.6 million.

The Vermont senator certainly has enough money: The Sanders campaign said it raised $33 million in the 4th fundraising quarter (from October to December) -- just $4 million less than Clinton's haul.

The biggest overall ad spender this week was Jeb Bush and his allies, with his campaign and Super PAC spending a whopping $4.8 million in ads – more than five times what Sanders has spent.

The biggest ad spenders this week (from Jan. 3-9):