Originally posted by: Hafen
Ah, its not quite so simple as that. The president needs popular support for two reasons: A strong president can push the Senate to follow his agenda. With low pop support, moderate R senators may be willing to fight Bush to please their local constituencies, or at least not so willing to hitch themselves to his sinking ship if he would nominate somebody controversial (esp w/ big election in '06).
To be safe you need 60 votes, and popular support of the public to prevail in the PR fight afterwards. An unpopular president may not be able to turn the "obstructionist" card on the Dems, but may popularly suffer the label as nominating a crony/incompetant/ or radical. In such as case, Dems could win points by blocking the "bad" choice and force a more moderate nominee as the next pick. Not to mention it would also harm the senators who voted for such a pick.
Just after 9/11, Bush could have nominated Pol Pot and been able to ram him thru. Now is going to be really tough for Bush facing a skeptical public.