text: Marco Rubio endorses Iowa’s Joni Ernst
  U.S. Senate primary elections are Tuesday night to replace retiring Sen. Tom Harkin, and Joni Ernst is the frontrunner in the polls.
  Florida Sen. Marco Rubio made a special trip from Washington, D.C. to support Ernst at a final campaign event at her Urbandale headquarters.
  “He has called me a conservative principled leader, and I’m so glad to have his support,” she said.
  Also vying to be the first Republican to date to take that Senate seat in decades are Sam Clovis, Mark Jacobs, Matt Whittaker and Scott Schaben.