We've been fact-checking political campaign ads in partnership with NPR. In our latest installment, we looked at ads from the Republican primary in the U.S. Senate race in Colorado. The candidates are Jane Norton, a former lieutenant governor who got early backing from Republican Party leaders, and Ken Buck, a district attorney who has received backing from the tea party movement. Here's what two bare-knuckled ads had to say: "Our country is at the brink," a narrator says in an ad from Americans for Job Security. "Colorado families and workers need relief -- yet Jane Norton supported the largest tax ... >>More