The March of Dimes has moved its annual walk to Main Street McMinnville in hopes of generating interest from merchants and gaining more participation from walkers.Organizers say the time is now to start forming a team, or to start collecting donations for the Oct. 15 walk.This year’s ambassadors are Kate and Mason Gribble, the children of Darrell and Jennifer Gribble. The twins were born seven weeks early, but are now healthy and active at over 2 years old.“Our story starts when I was nine weeks pregnant,” said Jennifer in telling her story in a March of Dimes pamphlet. “I went to the doctor to hear my baby’s heartbeat for the first time.