Thousands of people head south during the annual Labor Day Mackinac Bridge Walk, Monday, Sept. 3, 2012. Gov. Rick Snyder has led thousands of walkers and runners across the bridge for o

 

              Thousands of people head south during the annual Labor Day Mackinac Bridge Walk, Monday, Sept. 3, 2012. Gov. Rick Snyder has led thousands of walkers and runners across the bridge for o
Thousands of people head south during the annual Labor Day Mackinac Bridge Walk, Monday, Sept. 3, 2012. Gov. Rick Snyder has led thousands of walkers and runners across the bridge for one of Michigan's most popular Labor Day traditions. (AP Photo/John L. Russell)