Poll: Dems have slight edge in 3 key Senate races
Democrats enjoy a slight advantage over their Republican challengers in three key Senate races in Ohio, Florida and Virginia, according to three new NBC-Marist polls released Thursday. Democrats lead by varying margins in a series of contests that could determine whether Republicans are able to achieve the net-gain of four seats they need to retake control of the Senate if President Barack Obama wins re-election; they need to pick up just three seats if the Democratic incumbent loses.
