Why Democrats might struggle to achieve another midterm ‘blue wave’ in the US House

Eight years ago, Democrats flipped more than 40 seats with the help of dozens of veterans and candidates with service backgrounds motivated to run as a check on President Donald Trump.

​ Eight years ago, Democrats flipped more than 40 seats with the help of dozens of veterans and candidates with service backgrounds motivated to run as a check on President Donald Trump. Read More Breaking News, Latest News and Videos | CNN