Back in 2003, 46 Democratic Senators sent a letter to President Bush requesting the 28 pages be declassified:
http://28pagesdotorg.files.wordpress.com/2014/09/2003-senate-letter-re-28-pgs_signed2.pdf
Some of the signers still in the Senate today include:
Cantwell, Maria [WA]
Carper, Tom [DE]
Durbin, Dick [IL]
Harkin, Tom [IA]
Johnson, Tim [SD]
Landrieu, Mary [LA]
Leahy, Patrick [VT]
Levin, Carl [MI]
Mikulski, Barbara [MD]
Murray, Patty [WA]
Nelson, Bill [FL]
Pryor, Mark [AR]
Reed, Jack [RI]
Reid, Harry [NV]
Schumer, Chuck [NY]
Stabenow, Debbie [MI]
Wyden, Ron [OR]
Hillary Clinton, Joe Biden and John Kerry also signed the letter.