The vice president's visit to the battleground district marks his first return since November, as Republicans ramp up midterm messaging on economic policy Subscribe to WISN on YouTube now for more: http://bit.ly/1emE5YX Get more Milwaukee news: http://www.wisn.com Like us: http://www.facebook.com/wisn12 Follow us: http://twitter.com/WISN12News Instagram: https://www.instagram.com/wisn12news/