Although still about 45 days away, early voting for the 2018 midterm elections began Friday in Minnesota and three other states. New Jersey follows tomorrow, with Illinois next Thursday. Several more states will follow in early October, with over 30 states offering some form of early voting by late in the month. Note that requirements vary by state; some require a valid excuse to avoid voting on Election Day. Also, in some states the early voting period varies by location.
Minnesota is notable due to the number of competitive races it has this year. Democratic Gov. Mark Dayton is not seeking a 3rd term. While the races leans Democratic, it is no sure thing. Likewise, in Minnesota's special election for U.S. Senate, incumbent Democratic Sen. Tina Smith is favored, but polling for this race has been much closer than for the 'regular' Senate election held by fellow Democrat Amy Klobuchar.