AP News Guide: Few top races, but big impact, in primary

[...] with few contested races, turnout was expected to be very low — which could lead to some surprising results.

Longtime conservative radio host Jason Lewis, businesswoman Darlene Miller, former state legislator John Howe and business consultant (and sometimes Donald Trump spokesman) Matt Erickson crowded into the GOP field.

Miller's campaign sent out mailers accusing Lewis of supporting heroin legalization; Lewis contends she wrongly twisted his remarks from his radio show.

Daudt was confident heading into the primary, and an outside political group came to his aid with advertisements when an opposing group started publicly criticizing his personal finances and political leadership.

[...] a loss could halt the Zimmerman Republican's rapid political rise, which has him pegged as a gubernatorial contender in 2018.

Hudson's other challenger is laid-off legal aid attorney Craig Foss, who has said he's running because he's having trouble finding work because he's legally blind.

Minnesota's secretary of state doesn't make turnout estimates, but Joe Mansky, Ramsey County's elections manager and a former state elections official, said he's expecting 5 percent turnout on his home turf.