A new round of NBC News/Marist polls released Sunday shows good news for Republicans, who appear to be getting closer and closer to the Senate majority they have sought for two years.

Republican candidates are ahead in two states they need to hold — Kentucky and Georgia — as well as one state they are hoping to pick up — Louisiana. Here's a closer look:

— In Kentucky, Senate Minority Leader Mitch McConnell (R) leads Secretary of State Alison Lundergan Grimes (D) 50 percent to 41 percent among likely voters.

— In Louisiana, where most observers expect the all-party primary to go to a runoff, Sen. Mary Landrieu (D) leads Rep. Bill Cassidy (R) 44 percent to 36 percent, with tea party long-shot Rob Maness clocking in at 15 percent. But in a runoff, Cassidy leads Landrieu 50 percent to 45 percent.

— In Georgia, which also could be headed for a runoff, Republican David Perdue leads Democrat Michelle Nunn 48 percent to 44 percent.