For Sadie Rosenthal, a senior at the University of Wisconsin-Madison, choosing to vote in the US swing state where she studies -- versus Maryland, where she's from -- is a no-brainer. "I know my vote is so incredibly important here as an out-of-state student, so I wasn't even hesitant when it came to switching my registration," the 22-year-old Kamala Harris supporter told AFP from the lakeside terrace of the campus's historic Beaux-Arts student center. In a presidential election where Democrat Harris and Republican Donald Trump are polling in a virtual dead heat, Wisconsin is among seven battleground states crucial to winning the White House. IMAGES AND SOUNDBITES