Democrats will gain Senate seats, probably between four and six, but their odds keep getting better, and there is even a remote possibility that they will pick up the nine they need to hit 60, the magic number needed to stop filibusters. They have strong pickup opportunities in Virginia, Alaska, Colorado, New Mexico and New Hampshire and are threatening in Orgeon, Minnesota and Mississippi. Only one Democratic seat is even remotely at risk -- the one in Louisiana. Democrats currently have a 51-49 advantage. Thirty-five Senate seats are up this year, 23 currently held by Republicans and 12 held by Democrats.