The National Republican Senatorial Committee has reserved $25 million in television ad space for the fall election, an NRSC official tells The Hill, a major early investment for the committee.

It's almost unheard of for campaign committees to begin reserving ad time this early in the cycle, and the buy is a sign of how much super-PACs could affect this election. The combination of heavy super-PAC spending and the high-dollar presidential race means airtime in many of these states will get much more expensive in upcoming months. Some states could run out of available airtime long before the election, something that happened near the end of the 2008 campaign.

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The buy is spread over six top targeted states: $5.5 million in Virginia, $5 million apiece in Missouri and Wisconsin, $3.5 million in Montana and $3 million apiece in Nevada and New Mexico. Most of those states are expected to be in play at the presidential level or have already seen heavy outside-group spending, making airtime purchase a prerogative.

Virginia has a competitive match-up between former Gov. Tim KaineTimothy (Tim) Michael KaineSenate GOP likely to nix plan Schumer feels pressure from all sides on spending strategy Manchin signals he'll be team player on spending deal MORE (D) and former Sen. George Allen (R). In Missouri, Sen. Claire McCaskillClaire Conner McCaskillGiuliani to stump for Greitens in Missouri McCaskill shares new July 4 family tradition: Watching Capitol riot video Joe Manchin's secret MORE (D) is seen as a top GOP pickup opportunity. Montana Sen. Jon TesterJonathan (Jon) TesterBipartisan group says it's still on track after setback on Senate floor GOP blocks infrastructure debate as negotiators near deal GOP negotiators say they'll vote to start infrastructure debate next week MORE (D) is also seen as vulnerable. In Nevada, Republicans are defending newly appointed Sen. Dean HellerDean Arthur HellerDemocrat Jacky Rosen becomes 22nd senator to back bipartisan infrastructure deal 9 Senate seats most likely to flip in 2022 On The Trail: Democrats plan to hammer Trump on Social Security, Medicare MORE (R) against Rep. Shelley Berkley (D). Wisconsin and New Mexico have open seats.

The stand-out on the list is Wisconsin, where Republicans have argued for months that they feel any of their candidates could give a serious challenge to Rep. Tammy BaldwinTammy Suzanne BaldwinManaging the US dollar to pay for congressional infrastructure plans Duckworth, Pressley introduce bill to provide paid family leave for those who experience miscarriage Senate Democrats call for Medicaid-like plan to cover non-expansion states MORE (D-Wis.) in the open seat, despite the polls and many pundits giving Baldwin an edge over the other Republicans in the field. This buy indicates the committee is putting its money where its mouth is.

Potentially competitive states missing from the list including North Dakota, Nebraska, Michigan, Ohio and Florida, states where one party or the other seems to have the edge right now, as well as Massachusetts, where an agreement between Sen. Scott Brown (R-Mass.) and Democrat Elizabeth WarrenElizabeth WarrenWarren: Canceling K in student debt could 'transform an entire generation' 10 books that take readers inside the lives of American leaders Schumer leaves door open for second vote on bipartisan infrastructure deal MORE bars the committees from spending in the state.

Hawaii is also not on the list, although former Hawaii Gov. Linda Lingle (R) is known as a fundraising powerhouse and might not need the committee's help.

The NRSC official emphasized that this is the first of many buys, and other states could be added to the list.

The buy was first reported by Roll Call.