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Feinberg got off to a good start, locking up the endorsements of his two former bosses, Sens. Tom CoburnThomas (Tom) Allen CoburnMr. President, let markets help save Medicare Pension insolvency crisis only grows as Congress sits on its hands Paul Ryan should realize that federal earmarks are the currency of cronyism MORE (R-Okla.) and Rand PaulRandal (Rand) Howard PaulRand Paul's neighbor sentenced to 30 days in prison over assault Dems best GOP as Scalise returns for annual charity baseball game The Hill's Morning Report — Can the economy help Republicans buck political history in 2018? MORE (R-Ky.). But he struggled mightily at fundraising, having only $80,000 cash on hand as of April.

The deep-pocketed, fiscally conservative Club for Growth and the Campaign for Primary Accountability, which targets incumbents, both went after Murphy early on, but they backed down when it became clear he’d win the race.