Two groups bought almost $850,000 in ads on Spanish-language channels in Denver and Colorado Springs.
The anniversary of last year’s devastating floods has become a talking point in Colorado's U.S. Senate campaign.
The law Rep. Cory Gardner touts in a campaign ad for his Senate bid was repealed five years later after being deemed useless.
"This obstruction of our work is just so egregious," Sen. Udall told CPR News.
In an attempt to woo female voters, Democrats have long chided Republican candidates on the issues of abortion and birth control. One group says that’s a losing strategy.
U.S. Sen. Mark Udall, who is locked in a bitter re-election battle with Republican U.S. Rep. Cory Gardner, did not join Obama on stage or at a later fundraiser.
Colorado's Senate seat could be the key to which party controls Congress next year.