It's basically going to be like the 2010 Senate races, again. Democrats have a smaller and more vulnerable majority but we have our O'Donnell's, Raese's, Angle's, and Buck's in LA, NC, AK, and heck, even MT and if we hold at least 2 of those seats which I bet we will because Cassidy and Tillis will find some way to mess it up for Republicans, we'll control the Senate while we can enjoy some comedy in the defeat of Blanche Lincoln all over again in Arkansas!
So I think we lose about 4 seats and narrowly hold the Senate 51-49 in losing SD, WV, probably MT, and AK. A second case scenario is we lose SD, WV, MT, AK, one of either LA/NC/MI/CO, and then Dems pick up either KY or GA. If Nate Silver isn't right with his scenarios based on probability in the 2010 and 2012 Senate races, then I doubt he will this time either, and even then, he's only giving 3/5ths of a chance of GOP Senate control when the climate for Dems is still looking bad while Obamacare is only at 38% favorable. With President Obama's 7+ million goal nearly met with working, cheaper healthcare plans, it won't be an effective issue this year for Republicans and it could hurt them in losing the 3rd chance in a row for full Congressional control and losing more seats in the House. I'm still sticking by neither chamber flips and Dems make about 5 gubernatorial gains with 2 more lame-duck years for Obama, unfortunately.