Rep. Chris Van Hollen (D-Md.) announced Wednesday he plans to run for the U.S. Senate in 2016. "I am writing to let you know that I have decided to run for the United States Senate from our great state of Maryland," Van Hollen wrote in an email to supporters. "In my very first election for Congress I believed that people were tired of politics as usual, and I ran a campaign based on key issues and ideas that matter to our future.