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 KaineDem infighting erupts over Supreme Court pick Election Countdown: Latest on the 2018 Senate money race | Red-state Dems feeling the heat over Kavanaugh | Dem doubts about Warren | Ocasio-Cortez to visit Capitol Hill | Why Puerto Ricans in Florida could swing Senate race Green Day's 'American Idiot' climbs UK charts ahead of Trump visit MORE (D) and former Sen. George Allen (R). In Missouri, Sen. Claire McCaskillClaire Conner McCaskillThe Hill's Morning Report — Trump’s walk-back fails to stem outrage on Putin meeting Senate Dems build huge cash edge in battlegrounds Senate Dems lock in million in TV airtime MORE (D) is seen as a top GOP pickup opportunity. Montana Sen. Jon TesterJonathan (Jon) TesterElection Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas Senate Dems build huge cash edge in battlegrounds Fed chief lays out risks of trade war MORE (D) is also seen as vulnerable. In Nevada, Republicans are defending newly appointed Sen. Dean HellerDean Arthur HellerSenate Dems build huge cash edge in battlegrounds Jacky Rosen hits Dean Heller over health care in first negative ad GOP moderates hint at smooth confirmation ahead for Kavanaugh 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 BaldwinElection Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas Senate Dems build huge cash edge in battlegrounds Overnight Health Care: Over 7,000 fail to meet Medicaid work rules in Arkansas | Judge temporarily halts deportations of reunited families | GOP chair in talks over restarting ObamaCare payments 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 Ann WarrenTrump pick to face grilling over family separations On The Money: Commerce to review uranium imports | Lawmakers urge Trump not to impose auto tariffs | White House wants steeper cuts to EPA funding | Google hit with massive B fine Election Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas 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.