In Florida, the groups American Future Fund, Club for Growth and Our Principles PAC have spent a combined $4.2 million against Trump – in addition to the estimated $4.3 million that Marco Rubio’s Super PAC, Conservative Solutions PAC, has aired versus Trump.
By contrast, Trump’s campaign has fired back by spending $1.5 million in Florida.
In Illinois, American Future Fund, Club for Growth and Our Principles PAC have spent $2.5 million against the GOP frontrunner.
On the Democratic side, Hillary Clinton is outspending Bernie Sanders in the March 15 states of Florida and Illinois, while Sanders is outspending Clinton in Missouri, North Carolina and Ohio.
SOURCE: SMG Delta
This story originally appeared on NBCNews.com.