Tuesday's round of primaries revealed who would face off in this November's midterm elections — and made a blue wave seem even more imminent. When it comes to turnout, Democrats outperformed Republican in all four states that voted Tuesday, NBC News points out. While that doesn't guarantee the party will dominate this fall, it does reflect strong Democratic enthusiasm that's translated into high turnout throughout the 2018 primary season. The Democratic difference was most obvious in Minnesota, a reliably blue state that saw 261,000 more Democratic voters than Republicans on Tuesday.