Former Florida Gov. Jeb Bush (R) and supporters have now spent roughly $20 million toward assaulting the airwaves thus far in the 2016 presidential race -- more than twice as much as any other candidate or outside group -- according to data from media and communications agency SMG Delta.

The campaign committee itself has spent $438,000 on TV ads in early primary states Iowa, New Hampshire, and South Carolina, dwarfed by the $19.5 million sum spent by the pro-Bush Super PAC, Right to Rise.

By comparison, Conservative Solutions Project -- which supports Florida Sen. Marco Rubio (R) -- has spent $8.4 million and groups supporting former Secretary of State Hillary Clinton (D) have spent $8.3 million.

Other big spenders to this point in the 2016 election season include:

• Ohio Gov. John Kasich (R): $7.3 million -- all from two outside groups
• New Jersey Gov. Chris Christie (R): $5.7 million -- $407,000 from the campaign, $5.3 million from Super PAC
• Louisiana Gov. Bobby Jindal (R) (who has just suspended his campaign): $3.3 million -- all from outside groups
• Vermont Sen. Bernie Sanders (D): $3 million -- all from the campaign
• South Carolina Sen. Lindsey Graham (R): $1.7 million -- $100,000 from the campaign, $1.6 million from Super PAC
• Ben Carson (R): $1.5 million -- all from the campaign