New NBC News/Marist polls show Republicans with an edge among registered voters in Senate races in Kentucky, Georgia and Louisiana.

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Sen. Minority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellOcasio-Cortez to voters: Tell McConnell 'he is playing with fire' with Ginsburg's seat McConnell locks down key GOP votes in Supreme Court fight Video shows NYC subway station renamed after Ruth Bader Ginsburg MORE (R-Ky.) leads Alison Lundergan Grimes, 50 to 41 percent, in Kentucky.

David Perdue (R) leads Michelle Nunn, 48 to 44 percent in the race for Georgia’s open U.S. Senate seat.

In Louisiana, Sen. Mary Landrieu Mary Loretta LandrieuBottom line A decade of making a difference: Senate Caucus on Foster Youth Congress needs to work to combat the poverty, abuse and neglect issues that children face MORE (D-La.) leads her Republican challengers with 44 percent, the poll found. Rep. Bill Cassidy (R) gets 36 percent support and Rob Maness (R) gets 15 percent.

Landrieu trails both Republicans in a hypothetical runoff, however. Cassidy would have 50 percent support in a head-to-head matchup versus Landrieu’s 45 percent. Maness would also take 50 percent in a runoff compared to Landrieu’s 46 percent, according to the poll.

The pollsters found President Obama was dragging down the Democratic candidates in the three key southern states. His approval is 41 percent in Georgia, 32 percent in Kentucky and 39 percent in Louisiana.