Story highlights Key to a Cruz win in Iowa could be the support of Steve King, one of the state's four congressman

The support of his son, Jeff King, could be a signal for who Steve King could eventually support

Washington (CNN) Jeff King, a top political aide to his father and Iowa powerbroker, Rep. Steve King, has signed on with the super PAC supporting Ted Cruz, the organization confirmed to CNN Friday.

In what could be a signal for who his father -- one of Iowa's most coveted endorsements -- could eventually support, Jeff King is now consulting for one of the four main super PACs supporting Cruz, Keep the Promise I. That group, funded almost entirely by New York hedge-fund magnate Robert Mercer, launched its first advertisements this week and unveiled some of the operatives that will execute the group's paid-media campaign.

Super PACs have traditionally limited their work to exclusively television advertisements, but the independent groups are increasingly turning their focus this cycle to get-out-the-vote programs in early-voting states. The Cruz campaign and its allies believe he needs to earn a top billing in the Hawkeye State, where Cruz appears stuck in the polls despite the state lending itself well to Cruz's evangelicalism.

Key to a Cruz win could be the support of Steve King, one of the state's four congressman and perhaps Capitol Hill's leading anti-immigration voice. King and Cruz are close friends and have appeared together as the senator stumped across the state, but King has relished the role he could play as a kingmaker in the state.

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