New polling for key races in both Arkansas and New Hampshire could determine control of the U.S. Senate.
First to Arkansas, where a new poll from CNN and Opinion Research shows Republican challenger Tom Cotton has a two point lead over incumbent democratic Senator Mark Pryor among likely voters. It's Cotton 49, Pryor 47.
Next, to New Hampshire where a poll by the Republican super PAC American Crossroads shows Democratic Senator Jeanne Shaheen up three over Scott Brown, 44% to 41%. Brown debated his Republican challengers Thursday ahead of next week's primary.