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 PortmanRob PortmanGOP governors defend Medicaid expansion Senators introduce dueling miners bills Schumer puts GOP on notice over ObamaCare repeal 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 ReidThe DC bubble is strangling the DNC Dems want Sessions to recuse himself from Trump-Russia probe Ryan says Trump, GOP 'in complete sync' on ObamaCare 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.