Zappos.Com Rock 'n' Roll Las Vegas Marathon

Half marathon runners make their way northbound on the Las vegas Strip during the Zappos.com Rock 'n' Roll Las Vegas Marathon Sunday, Dec. 2, 2012.

Half marathon runners make their way northbound on the Las vegas Strip during the Zappos.com Rock 'n' Roll Las Vegas Marathon Sunday, Dec. 2, 2012. by Steve Marcus