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Latham, an establishment Republican close to Speaker John BoehnerJohn Andrew BoehnerLobbyists race to cash in on cannabis boom Rising star Ratcliffe faces battle to become Trump's intel chief This little engine delivers results for DC children MORE (R-Ohio), would have been a formidable general election candidate for the seat currently held by retiring Sen. Tom HarkinThomas (Tom) Richard HarkinWisconsin lawmaker gets buzz-cut after vowing not to cut hair until sign language bill passed Democratic debates kick off Iowa summer sprint Key endorsements: A who's who in early states MORE (D-Iowa) — he's a proven campaigner and a strong fundraiser. But he faced the daunting prospect of running against Rep. Steve King (R-Iowa), a Tea Party favorite who is moving towards a run.

Polls show that Latham would have had a strong chance against Rep. Bruce BraleyBruce Lowell BraleyOPINION | Tax reform, not Trump-McConnell feuds, will make 2018 a win for GOP Ten years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer MORE (D-Iowa), Democrats' early front-runner — but also show that King would have had a big early lead in the GOP primary.