So who could be on the fence about the DREAM Act? A pro-DREAM group is urging its members to call the following senators:

Cornyn, John- (R - TX) (202) 224-2934
Hutchison, Kay Bailey- (R - TX) (202) 224-5922
Thad Cochran (202) 224- 5054
Norm Coleman(202) 224-5641
John Sununu (202) 224-2841
Olympia Snowe (202) 224-5344
Jon Tester (202) 224-2644
Richard Burr (202) 224-3154
John Warner (202) 224-2023
Lindsey Graham (202) 224-5972
Judd Gregg (202) 224-3324
Chuck Grassley (202) 224-3744
Tim Johnson (202) 224-5842
Robert Byrd (202) 224-3954
Byron Dorgan (202) 224-2551
Pete Domenici (202) 224-6621
Max Baucus (202) 224-2651
Larry Craig (202) 224-2752
Ted Stevens (202) 224-3004
George Voinovich (202) 224-3353
Lisa Murkowski (202) 224-6665
Claire McCaskill (202) 224-6154
Benjamin Nelson (202) 224-6551
John Barrasso (202) - 224-6441
Susan Collins (202) 224-2523
Crapo (202) 224-6142
Bennet (202) 224-5444
Martinez (202) 224-3041
Sen Brownback, Sam [KS] - (202) 224-6521
Sen Landrieu, Mary L. [LA] - (202) 224-5824
Sen Ensign (202) 224-6244

It excludes both (very) likely opponents (e.g. Sessions) and supporters (e.g. Durbin) of the DREAM Act, so this may give some hint of where the undecided senators are. Is this list reliable?

UPDATE 10/23: Could this vote on the filibuster be pretty close? According to one news source, Durbin's trying to sound confident:

Durbin said that the vote tally was “somewhere in the mid 50’s” and that Republican support was growing “by the minute.”

There are a lot of minutes until Wednesday. 60 votes are needed to override a filibuster. Durbin is probably playing the expectations game, but that game doesn't always work out: a lot of folks were confident the "grand bargain" would pass the Senate in June, and it didn't. So this probably isn't decided one way or another yet--but I could be wrong.

(Via Malkin) Cornyn's office has released a statement saying that he'll vote against the motion to proceed to the DREAM Act tomorrow.

NumbersUSA lists the following 21 senators as being confirmed against the DREAM:

Alabama: Sessions; Shelby
Arizona: Kyl [[UPDATE 10/24]]
Colorado: Allard
Georgia: Chambliss; Isakson
Kansas: Roberts
Kentucky: Bunning; McConnell
Louisiana: Vitter
Mississippi: Lott
Missouri: Bond
North Carolina: Burr; Dole
Oklahoma: Coburn; Inhofe
South Carolina: DeMint
South Dakota: Thune
Tennessee: Alexander; Corker
Texas: Cornyn [[UPDATE 10/24]]
Wyoming: Barrasso; Enzi

It has this breakdown of other senators ("red" means declared supporters of DREAM and "green" means that these senators' offices "are consistently telling their constituents that they will vote NO on the amnesty [i.e. DREAM] . But they have declined to pledge a NO vote to NumbersUSA staff"):

California: Boxer 224-3553; Feinstein 224-3841
Colorado: Salazar 224-5852
Connecticut: Dodd 224-2823; Lieberman 224-4041
Florida: Martinez 224-3041; Nelson (Bill) 224-5274
Illinois: Durbin 224-2152; Obama 224-2854
Louisiana: Landrieu 224-5824
Maryland: Cardin 224-4524; Mikulski 224-4654
Montana: Baucus 224-2651; Tester 224-2644
Nebraska: Hagel 224-4224; Nelson (Ben) 224-6551
New Hampshire: Gregg 224-3324; Sununu 224-2841
New Jersey: Lautenberg 224-3224; Menendez 224-4744
South Carolina: Graham 224-5972
Utah: Bennett 224-5444; Hatch 224-5251

If all those in "green" vote as their offices are telling their constituents, and everything else stays the same, it looks like opponents of DREAM may have at least 26 [[UPDATE: 27]] votes (21 confirmed + Cornyn + 4 greens). A lot of senators who ultimately did not support the "grand bargain" sound officially undecided, so there could be a lot of play. Who could be some crucial swings? I might guess: McCaskill (D-MO), Coleman (R-MN), Byrd (D-WV), Murkowski (R-AL), Hutchison (R-TX), Collins (R-ME), Grassley (R-IA), Bingaman (D-NM), Dorgan (D-ND), Baucus (D-MT) (if Tester's really going to oppose cloture), Pryor (D-AR). Maybe?

UPDATE: A source tells John Hawkins that McConnell and R leadership in the Senate really want to keep the vote margin under 60. His sources also don't quite know how the vote count stands at the moment....

UPDATE 10/24: NumbersUSA now has Kyl (R-AZ) as declared against the DREAM, so opponents now may have at least 27 votes.
Malkin draws attention to this detail in a USA Today story:

Sen. Dick Durbin, D-Ill., the legislation's chief sponsor, said Tuesday that his biggest challenge was ensuring that supporters, including five senators — four Democrats and one Republican — running for president, make it to the Capitol for the roll call.

Another question mark: Democratic Sens. Dianne Feinstein and Barbara Boxer, who are trying to return to California to review wildfire damage.

UPDATE: I'm keeping a running tally here.