One of the most popular politicians in Wisconsin history says he will decide in April if he will run for governor once again. Eighty-year-old Tommy Thompson will step down as Interim University of Wisconsin System President next month. Thompson says he will make his decision after that. The state’s Republican field for governor is already crowded with Rebecca Kleefisch, Kevin Nicholson, and state Representative Tim Ramthun campaigning for Wisconsin’s top statewide elective office. Thompson has been elected governor four times. He left office 20 years ago to serve as U-S Secretary of Health and Human Services in the George W. Bush administration.