With the launch of two new TV ads against Republican Ken Buck in Colorado, the Democratic Senatorial Campaign Committee has topped $6 million in independent expenditures in the state.

The similar ads slam Buck on many of his stances that Democrats say are too out of the mainstream for voters to trust him in the Senate.

“I just can’t vote for Ken Buck,” one voter featured in both ads says. “He’s just too out there,” says another.

The National Republican Senatorial Committee, which just launched another ad against Sen. Michael Bennet (D), has spent $4 million in Colorado.

Nearly $30 million of outside money has been spent on this race, according to the Sunlight Foundation, by far the most of any race this cycle.