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In Indiana, a state once key to a Republican majority, chances look less favorable for the party as a gaffe from GOP candidate Richard Mourdock has damped his odds. In Missouri, Rep. Todd Akin (R ) has made up some ground but there are questions as to whether he can recover from his controversial remarks on rape.

And, in Nebraska, Democrat Bob Kerrey suddenly looks capable of mounting a come-from-behind win against Republican Deb FischerDeb FischerGOP rep scolds Gillibrand for tearing into Marine general over nude-photo scandal Senators tear into Marines on nude photo scandal Five takeaways from the Scott Pruitt emails MORE, though he faces an uphill battle in the red-leaning state.

A recent independent poll, the first since September, showed him closing his gap substantially and lagging Fischer by just 3 points. The sudden opening in the race inspired an influx of outside spending, with Crossroads GPS launching a $420,000 ad buy to shore up their bet, while independent group VoteVets Action Fund spent $300,000 on ads attacking Fischer this past week.

Kerrey also rolled out the endorsement of former GOP Sen. Chuck HagelChuck HagelSenators tear into Marines on nude photo scandal Lobbying World Who will temper Trump after he takes office? MORE, a revered political figure in the state, as part of a last-minute push for support.

It remains a long-shot — Fischer formerly posted consistent double-digit leads on Kerrey, and Mitt Romney leads President Obama by a similar margin — but Kerrey's mounting an improbable challenge in the final days of the campaign, and The Hill has moved the race from Likely to Lean Republican.

These ratings and projections will be updated throughout the campaign cycle. The full Senate ratings are below. Ratings for the House are available on The Hill’s Ballot Box blog under the Race Rating category.

The Hill's 2012 Race Ratings: Senate

Likely Democratic Lean Democratic Toss-up Lean Republican Likely Republican
HI: OPEN (Akaka)CT: OPEN (Lieberman)AZ: OPEN (Kyl) NE: OPEN (Nelson)
MI: Stabenow (D)FL: Nelson (D)IN: OPEN (Lugar)

MN: Klobuchar (D)MA: Brown (R)MT: Tester (D)
 
NJ: Menendez (D) ME: OPEN (Snowe)**NV: Heller (R)    
WV: Manchin (D)  MO: McCaskill (D)ND: OPEN (Conrad)    
  NM: OPEN (Bingaman)VA: OPEN (Webb)    
  OH: Brown (D)WI: OPEN (Kohl)    
  PA: Casey (D)     
        
         
         
         
*Bold indicates a seat projected to switch parties.
**Former Maine Gov. Angus KingAngus KingGOP rep scolds Gillibrand for tearing into Marine general over nude-photo scandal This week: GOP works to corral votes on healthcare plan Maine senator: House GOP healthcare plan hammers my state MORE (I) is expected to caucus with Democrats if elected.