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A "blue slip" is a Senate Judiciary Cmte issue . . . for example, as a Senate courtesy it has been a Senate tradition that all federal judicial nominees made by the president be "okayed" by each Senator from where the nominees lives. The paper procedure to do so in the Senate was completed on a piece of paper colored blue. Hence the name "blue slip." If a Senator approved of the judicial nominee then s/he would return the "blue slip" with such approval. But if a Senator disapproved of a nominee then the "blue slip" was return as rejected or not returned at all. A rejected "blue slip" meant that the nominee's Senate procedure would not go forward. It would be successfully blocked. I believe it was Senator Orrin Hatch who, as Senate Judiciary Chair, stopped the "blue slip" procedure. I could be wrong. However, it was within this Bush Administration, I believe, that it occurred. Try a google search on it.
As for the ABA issue. George Walker Bush, shortly after his first inauguration, announced that he would
not ask for, nor rely upon, any recommendation of the ABA regarding any federal judicial nominee. He stated, or someone from his Administration stated, that the ABA was a "liberal" organization and could not be relied upon to do an objective job. The ABA is well-known for its unbiased, objective research and recommendations of federal judicial nominees for sitting presidents for more than the last 1/2 century.
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edited to include:
Blue Slip Policy
(Senator Orrin) Hatch has also changed another fundamental Senate rule regarding judicial nominations. In the past, (Senator Orrin) Hatch has been a fervent supporter of the Senate’s “blue slip” policy, which has allowed home-state senators who object to a judicial nominee to delay action in the Judiciary Committee by not returning a nominee’s “blue slip” to the committee. As American Prospect has noted, “it was Hatch, in 1995, who hardened the blue-slip policy to allow a single senator to block a nomination indefinitely.” Indeed, Sen. Hatch made his blue slip policy explicit in 1998 by stating on the blue slips themselves that “(n)o further proceedings on this nominee will be scheduled until both blue slips have been returned by the nominee’s home state senators.”
Now, however, Hatch has apparently declared a new policy saying that even though a senator’s decision not to return a blue slip would be given great weight, it would not be allowed to prevent Hatch from moving nominees he wants to move. “In other words,” says Hatch, “we can go ahead with certain nominees where you might have a withheld blue slip.” Sen. Barbara Boxer has objected to proceeding on controversial nominee Carolyn Kuhl, but Hatch has scheduled a committee vote on the nomination on Thursday, May 8.
http://www.pfaw.org/pfaw/general/default.aspx?oid=10520 .