‘The middle is disappearing’: Why three dealmaking Senate Democrats are heading for the exits

After months of wrestling with the decision of whether to run for reelection for a third term in the swing state of Michigan, Sen. Gary Peters took a pass.

​ After months of wrestling with the decision of whether to run for reelection for a third term in the swing state of Michigan, Sen. Gary Peters took a pass. Read More Breaking News, Latest News and Videos | CNN