Scott Walker, governor of Wisconsin, arrives at Big Barn Harley-Davidson in Des Moines on June 6. Scott Walker plans to spend next week formally launching his presidential campaign - and then visiting five states in six days, a whirlwind trip that includes stops at four shops that sell Harley-Davidson motorcycles. The Republican governor of Wisconsin is a bit obsessed with Harley-Davidson , a Milwaukee-based company that he likes to plug while on the road.