The Congressional Leadership Fund is pouring another $1.5 million into the race between Rep. Jeff Denham and Democrat farmer Michael Eggman.
The group, which is endorsed by House Republican leaders, and works with the American Action Network, has now spent $3.5 million in the race. The race was initially viewed as an easy win for Denham (R-Turlock), but has become increasingly uncertain in recent weeks.
The district is being closely watched as an indicator of how Republican presidential nominee Donald Trump might affect down-ballot candidates. Democrats have spent more than $6 million in the district.
The Congressional Leadership Fund and American Action Network have spent $45 million in 32 districts nationwide so far and have aired ads in other California House races, including in the nearby 21st District race between Rep. David Valadao (R-Hanford) and attorney Emilio Huerta and the 7th District race between Rep. Ami Bera (D-Elk Grove) and Sacramento County Sheriff Scott Jones.
The group's newest ad in the 10th District race begins running on television Tuesday. It calls Eggman, an almond and bee farmer, an "extreme liberal" and a "rubber stamp" for House Minority Leader Nancy Pelosi (D-San Francisco) because he supports the Affordable Care Act.
It previously ran an ad against Eggman that used news footage from the 2015 San Bernardino terrorist attack.
FOR THE RECORD
2:14 p.m.: An earlier version of this article incorrectly referred to the Congressional Leadership Fund as the Conservative Leadership Fund.