Hedge fund manager Eric Hovde, pictured here on March 8, 2012, is one of four Republicans running in Tuesday's Senate primary in Wisconsin. (AP Photo/Scott Bauer)
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Voters in Minnesota head to the polls Tuesday for a primary election - and there's also a primary election in Wisconsin.
Democrat Sen. Herb Kohl is retiring this fall, leaving an open seat. The Democrats have united behind Congresswoman Tammy Baldwin, while the Republicans have four Senate candidates running in Tuesday's primary.
Shawn Johnson, the state government reporter for Wisconsin Public Radio, will join us to discuss that and other races on the primary ballot.
Tens of thousands of people around the world have said they want to go to Mars, even if it means they will never return to Earth. Dozens of them were in the crowd Tuesday night at the Fitzgerald Theater for Science Night Minnesota — Mission to Mars. Read about Science Night.