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American Crossroads is going on the air in Nebraska for the final week of the Senate campaign, according to a source tracking media buys. It's a signal that Republicans are concerned about state Sen. Deb Fischer's prospects in the wake of recent polling showing a closer race with former Democratic Sen. Bob Kerrey.

Crossroads GPS had been on the air in Nebraska early in the campaign, targeting Kerrey shortly after the May primary. But polls over the spring and summer showed a big lead for Fischer in the Senate race, and a Fischer win has been considered very likely.

Then a mid-October Kerrey internal poll showed him down just 5 points to the Republican. And an Omaha World-Herald poll released this weekend showed Kerrey lagging by just 3 points. Fischer's campaign countered with an internal poll showing her with a hefty 16 point lead.

The race, in GOP-leaning Nebraska, remains an uphill climb for Kerrey -- but it doesn't look as impossible as it did as recently as a few weeks ago.