On the regular-American-news-outlets-that-covered-Horner's-victory, you can add Grantland (an ESPN subsidiary aimed at a statistically- and culturally-aware crowd)
Chris Horner, the Unlikely American Cycling Hero
...But with apologies to the real cycling fans of the Internet, I'm going to make five assumptions about you, the Grantland reader who stumbled on this article.
First, you've only ever heard of the Vuelta in passing, if at all, and ditto for Chris Horner.
Second, you're wondering why you should care.
Third, you lack some basic facts.
Fourth, the first word that comes to mind when you come across a cycling story is "doping."
Fifth, you've yet to encounter the poetic side of the sport...
Nice article, trying to explain some of the basics of bike racing to the unfamiliar sports fan.
Unfortunately, it was posted at 5:30 PM on a Wednesday, and apparently most people who read Grantland check the website while at work.