RADFORD — An Ohio man’s interaction with candidate Barack Obama in 2008 gave rise to “Joe the Plumber.” Now, a Radford businessman’s decision not to host an “unscheduled” campaign event with Vice President Joe Biden on Wednesday has sparked a news story that’s gone viral and led to a surge in business.Just call him, “Chris the Baker.” Chris McMurray had just opened his bakery, Crumb and Get It, Wednesday morning when he received a visit from Biden’s advance team asking if he’d host the vice president for a media event on the way to his scheduled speech at Virginia Tech.McMurray...