The Republican senator officially began the campaign with a rally at Unico-SGI Manufacturing in Arnold, the first of a 10-stop, two-day tour across the state. Blunt's office says the location was chosen because he helped save the business from what it calls ``onerous federal regulations.''
Blunt is seeking his second term in the Senate. He served in Congress representing southwest Missouri from 1997 to 2011.
The only other Republican in the race is a political newcomer, Christopher Batsche. Missouri Secretary of State Jason Kander is seeking the Democratic nomination to oppose Blunt in November.