LANSING, Mich. (AP) -- Backed by outside groups and their own fortunes, two insurgent Republicans are trying to knock off a pair of incumbent House members in Michigan's primary.
But it's not what you think.
These challengers are more at home in the party's establishment. Both are wealthy, business-oriented candidates looking to knock out tea party-backed conservatives.
In suburban Detroit, lawyer Dave Trott is targeting Rep. Kerry Bentivolio, a former reindeer farmer, teacher and auto designer viewed by some as an "accidental" congressman.
In western Michigan, Grand Rapids investment adviser Brian Ellis faces libertarian-leaning, two-term Rep. Justin Amash. He's known for sparring with House GOP leadership and fiercely opposing National Security Agency surveillance of Americans.