"We make a difference in every single step along the path of our democracy."

  That's what Tim McGraw tweeted on Thursday, July 19 when he shared a new PSA led by former first lady Michelle Obama encouraging voter registration and participation in the U.S.

  McGraw and wife Faith Hill represent country music in the PSA's celebrity phone tree with Obama, actor Tom Hanks, Broadway star Lin-Manuel Miranda, Janelle Monae and Chris Paul.