Some of the citizens that Julianne Cravotto has helped register to vote may just one day cast their ballots for her. The political science and history major, to be honored as the top graduating senior at UC Davis, is embarking on a career in public service and has ambitions of being a state legislator. And the award she has won attests that she is well on her way. The University Medal — to be presented at the College of Letters and Science commencement at 7 p.m. Saturday, June 15 — recognizes excellence in undergraduate studies, outstanding community service, and the promise of future scholarship and contributions to society.