minnesota governor mark dayton undergo surgery early next month prostate cancer say statement tuesday staff dayton 70 say last week weigh treatment options say cancer late january day announce diagnosis dayton collapse deliver state-of-the-state address st. paul late say think faint episode relate illness dayton surgery remove prostate march say statement operation do mayo clinic rochester minnesota dayton say need spend one night hospital cancer spread beyond prostate dayton say dayton democrat serve six years u.s. senator minnesota elect first term governor 2010. current term run early 2018. minnesota governor undergo surgery cancer march