KEY POINTS
  • The battle to win the Republican Iowa caucus is the most expensive on record, with over $120 million in ad spending by campaigns and their affiliated political action committees.
  • Around $84 million of the total ad buys were in support of the top three candidates, Trump, Haley and Florida. Gov. Ron DeSantis,
  • The massive amount of resources put into Iowa this time reflects how competitive candidates and their allies still believe the race to be, despite Donald Trump's dominance in the polls.
Heavy snow falls as a man walks along the Skywalk system that connects buildings in downtown on January 08, 2024 in Des Moines, Iowa. 

The battle to win the Republican Iowa caucus is the most expensive on record, with over $120 million spent on ads by the campaigns and their affiliated political action committees in the Hawkeye State, according to data provided to CNBC by AdImpact.

The massive amount of resources placed into Iowa reflects how competitive candidates and their allies still believe the GOP nomination race to be, despite Donald Trump's dominance in the polls. Going into Monday's caucus, Trump's lead over his closest rival, former South Carolina Gov. Nikki Haley, averaged 33 percentage points, according to a Real Clear Politics polling aggregation.