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 Portman13 GOP senators ask administration to pause separation of immigrant families Lawmakers, businesses await guidance on tax law Harvard biz school honors Wilbur Ross 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 Mason ReidAmendments fuel resentments within Senate GOP Donald Trump is delivering on his promises and voters are noticing Danny Tarkanian wins Nevada GOP congressional primary 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.