What the GOP Needs to Do to Win the Senate

Republicans enter the home stretch of the 2014 campaign favored to retake the Senate, based simply on the number of paths they have to 51 votes.

Fighting on heavily Republican terrain, GOP candidates have built on expected advantages in a handful of deeply red states to threaten incumbents across the South and beyond. They're also moving into what was Obama territory, particularly Iowa and Colorado, while solidifying their chances in states including Arkansas and Alaska.

But just enough wild cards remain in the deck to keep Republicans from early celebrations. Surprising developments in Kansas and Georgia - and even continued uncertainty in Mitch McConnell's race in Kentucky - are keeping the majority in play for Democrats in the final push.

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Below are the latest race ratings from the ABC News Political Unit, with Democrats listed on the left and Republicans on the right:

TOSS UP: 5 totalColorado: Udall (i)* vs. GardnerGeorgia: Nunn vs. Perdue**Iowa: Braley vs. ErnstKansas: Orman*** vs. Roberts (i)Louisiana: Landrieu (i) vs. Cassidy, Maness**LEAN DEMOCRATIC: 2 totalNew Hampshire: Shaheen (i) vs. BrownNorth Carolina: Hagan (i) vs. TillisLEAN REPUBLICAN: 4 totalAlaska: Begich (i) vs. SullivanArkansas: Pryor (i) vs. CottonKentucky: Grimes vs. McConnell (i)South Dakota: Weiland vs. Rounds vs. Pressler****LIKELY DEMOCRATIC: 4 totalMichigan: Peters vs. LandMinnesota: Franken (i) vs. McFaddenOregon: Merkley (i) vs. WehbyVirginia: Warner (i) vs. GillespieLIKELY REPUBLICAN: 1 totalWest Virginia: Tennant vs. CapitoSOLID DEMOCRATIC: 7 totalDelaware: Coons (i) vs. WadeHawaii: Schatz (i) vs. CavassoIllinois: Durbin (i) vs. OberweisMassachusetts: Markey (i) vs. HerrNew Jersey: Booker (i) vs. BellNew Mexico: Udall (i) vs. WehRhode Island: Reed (i) vs. ZaccariaSOLID REPUBLICAN: 13 totalAlabama: Sessions (unopposed)Idaho: Mitchell vs. Risch (i)Maine: Bellows vs. Collins (i)Mississippi: Childers vs. Cochran (i)Montana: Curtis vs. DainesNebraska: Domina vs. SasseOklahoma: Silverstein vs. Inhofe (i)Oklahoma: Johnson vs. LankfordSouth Carolina: Dickerson vs. Scott (i)South Carolina: Hutto vs. Graham (i)Tennessee: Ball vs. Alexander (i)Texas: Alameel vs. Cornyn (i)Wyoming: Hardy vs. Enzi (i)* (i) signifies the incumbent.** Georgia and Louisiana Senate races likely headed to runoff. *** Orman is an Independent candidate.**** Pressler is an Independent candidate.Get real-time results pushed to your phone on Election Night. Click here to sign up for the races that matter most to you.