(Duluth, MN)  – Grandma’s Marathon and Members Cooperative Credit Union (MCCU) announced today a multi-year partnership, with Members Cooperative Credit Union becoming an official presenting sponsor of Grandma’s Marathon. Members Cooperative Credit Union will be joining Toyota at the highest sponsor level for the 41st running of the event on June 17, 2017. Registration opened on October 1, 2016 for all three-weekend races.