Doctor analyzes Sen. Mitch McConnell's latest episode

Senate Republican leader Mitch McConnell appeared to briefly freeze up and was unable to answer a question from a reporter at an event in Kentucky on Wednesday. Dr. David Thaler from Tufts Medical Center looks at the video and offers some possible explanations. Subscribe to WCVB on YouTube now for more: http://bit.ly/1e8lAMZ Get more Boston news: http://www.wcvb.com Like us:   / wcvb5   Follow us:   / wcvb   Instagram:   / wcvb5