Boca Raton, Florida (CNN) - Restore Our Future, the Super PAC supporting Mitt Romney, has reserved television airtime in Maine beginning later this week, according to a Republican source tracking media buys.
The group plans to air $300,000 worth of ads in the Bangor, Presque Isle and Portland-Auburn markets, the latter of which also covers parts of New Hampshire, from Oct. 25 through Oct. 29.
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The move suggests Romney allies see Maine's 2nd Congressional District, which encompasses the state's northern reaches, as fertile ground for the Republican.
Maine allocates its electoral votes by congressional district, and winning a single vote there could be a factor in a tight race.
Surveying the map of contested swing states, one scenario jumps out: If Obama loses Florida, North Carolina, Ohio, Colorado and Iowa, but holds Wisconsin, Virginia, New Hampshire and Nevada, he still picks up the 270 electoral votes needed to win.
But a victory for Romney in Maine's 2nd District would push that total back down to 269 votes and force a tie in the Electoral College.
CNN reported on what would happen in the event of an Electoral College tie back in July.
In 2008, then-candidate Barack Obama picked up a single electoral vote in Nebraska's 2nd Congressional District.