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Latham, an establishment Republican close to Speaker John BoehnerJohn BoehnerChaffetz calls for ,500 legislator housing stipend GOP super-PAC promises big spending in 2018 Ryan reminds lawmakers to be on time for votes MORE (R-Ohio), would have been a formidable general election candidate for the seat currently held by retiring Sen. Tom HarkinTom HarkinDistance education: Tumultuous today and yesterday Grassley challenger no stranger to defying odds Clinton ally stands between Sanders and chairmanship dream 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 BraleyTen years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer Criminal sentencing bill tests McConnell-Grassley relationship MORE (D-Iowa), Democrats' early front-runner — but also show that King would have had a big early lead in the GOP primary.