Are you looking for a nonpartisan guide to the Mack/Nelson US Senate race, one that contrasts candidate stands in a fair way? The Campus Election Engagement Project, a nonpartisan effort to get students involved in the election, has produced guides for the presidential race and key Senate races that institutions like colleges and other nonprofits can circulate to give their communities accurate information in a way that they can't with more partisan guides.
For more detailed info on any of Connie Mack's positions, go to his Vote Smart page and click on the [....] to the right of issue you're interested in.
Bill Nelson did not post a Vote Smart page. For more detailed information on his stands on issues, go to his page at On the Issues.