Alaska Senate candidate Dan Sullivan's (R) family is stepping up to help his campaign, giving $300,000 to a super-PAC backing Sullivan.

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Sullivan's parents and brother combined to give the money to Alaska's Energy/America's Values in July, according to recently filed campaign finance reports.

The Sullivan family, based in Ohio, runs RPM International and has been a major Republican donor for years, and is a close ally of National Republican Senatorial Committee Vice Chairman Rob PortmanRobert (Rob) Jones PortmanMcConnell names Senate GOP tax conferees Overnight Finance: House approves motion to go to tax conference — with drama | GOP leaders to consider Dec. 30 spending bill | Justices skeptical of ban on sports betting | Mulvaney won't fire official who sued him How four GOP senators guided a tax-bill victory behind the scenes MORE (R-Ohio).

Democrats have sought to make hay out of Sullivan's Ohio upbringing and the outside money flooding in to help him, while Republicans have flogged the fact that the super-PAC backing Begich is mostly being funded by Senate Majority PAC, a group with close ties to Senate Majority Leader Harry ReidHarry ReidBill O'Reilly: Politics helped kill Kate Steinle, Zarate just pulled the trigger Tax reform is nightmare Déjà vu for Puerto Rico Ex-Obama and Reid staffers: McConnell would pretend to be busy to avoid meeting with Obama MORE (D-Nev.).

Sullivan is the front-runner against Alaska Lt. Gov. Mead Treadwell (R) and 2010 Senate nominee Joe Miller (R) heading into next Tuesday's primary.