The National Republican Senatorial Committee (NRSC) is reserving between $6 million and $6.5 million worth of North Carolina television time, an NRSC source confirms to The Hill.

The major investment would help boost North Carolina House Speaker Thom TillisThom R. Tillis Former Sen. Kay Hagan in ICU after being rushed to hospital Senate fight over miners' heathcare boils over Lawmakers grill AT&T, Time Warner execs on B merger MORE (R) against Sen. Kay HaganKay Hagan Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock 2016’s battle for the Senate: A shifting map MORE (D-N.C.). Tillis has trailed Hagan by a narrow margin in most polls.

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"Our internals show that North Carolina is starting to break toward Thom Tillis, and we are prioritizing the North Carolina race, ensuring that Tillis has the resources necessary to defeat Kay Hagan," said NRSC spokeswoman Brook Hougesen. "Democrats have spent $43 million so far in North Carolina and Kay Hagan remains stuck at 44 percent. North Carolinians deserve to know that Tillis is the only candidate in the race with a proven record of getting things done unlike Hagan who has been asleep at the wheel on key national security issues from ISIS to our borders."

Tillis released an internal poll last week that found Hagan leading by 44 to 42 percent.

Republicans have expressed some frustration with Tillis's campaign, especially his weak fundraising, and Hagan has been able to maintain a small lead in the race partly by outspending him on television. But many Republican strategists have said — and this big buy confirms — that they believe if they can even out the air war that Tillis still has a real shot at victory.