Congresswoman Jacky Rosen is confirming she will seek the Democratic nomination to take on Sen. Dean Heller in 2018.  The Associated Press is reporting that she confirmed it in an e-mail. National Democrats  consider Heller’s seat the most vulnerable in 2018. Rosen is a staunch opponent of the GOP health care reform, something Heller has been waffling about for weeks. Rosen had never run for office before winning the congressional seat last year over Danny Tarkanian, and is a former computer programmer, software designer and president of a Henderson synagogue.