Republicans believe they can win New Mexico for the first time in 20 years — and conservative advocacy groups are spending big on Spanish-language commercials for the last two weeks of the election.

Ads on Spanish-language TV (SLTV) are Highly Effective. Ads on SLTV networks have been 31% more effective than those on English-language TV over the past year.

The group has already spent nearly $30 million on Spanish-language TV, radio and digital ads, according to the adviser, which would most likely make it the largest Spanish-language ad campaign of ...