Part Two of Nurse Talk Radio's Interview with Erin Murphy. National Nurses United, the nation's largest union of registered nurses, last week announced its endorsement of RN and State Representative Erin Murphy for Governor of Minnesota. “We are endorsing Erin because she’s a proven champion fighting for all Minnesotans,” said Jean Ross, RN, Co-President of National Nurses United and resident of Bloomington, Minn. murphyformn.com