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The super PAC plans to deploy television, radio, website and newspaper advertisements to oppose Carper's reelection, Davis said. 

Carper has been a senator since 2001. Before that, he served as a member of the House from 1983 to 1992.

The political action committee has shut the door on using funds raised to support or oppose additional candidates, opting to focus its efforts on keeping Carper out of office. 

“We think it’s important that the people of Delaware know about [his part in the downturn] and learn about Tom CarperThomas (Tom) Richard CarperTrump poised to sign bipartisan water infrastructure bill Overnight Health Care — Presented by the Coalition for Affordable Prescription Drugs — Senators face Wednesday vote on Trump health plans rule | Trump officials plan downtime for ObamaCare website | Lawmakers push for action on reducing maternal deaths Bipartisan group of senators ask Trump to increase focus on maternal deaths MORE’s record in the United States Senate,” Davis said.

Carper Spokesperson Emily Spain said the senator is setting up a team necessary for a successful reelection campaign, while still keeping Delaware's issues front and center.

“Campaign dynamics are constantly evolving whether it's the role of technology, campaign finance laws, or opponents, but Sen. Carper has always been successful in his reelection efforts because he works hard, takes nothing for granted, and puts the needs and interests of Delaware first. This re-election campaign is no exception," Spain told The Hill via e-mail. 

Kelly Casaday, the treasurer for a pro-Gary Johnson super PAC and manager at Letter 23, is listed as treasurer. 

The super PAC is registered as an independent expenditure committee, according to records disclosed on the website Friday. 

This means it will not “use those funds to make contributions, whether direct, in-kind, or via coordinated communications, to federal candidates or committees,” Casaday states in a letter attached to the registration.

—Updated at 4:10 p.m.