Their reasons vary, but nearly half of Senate Republicans say they remain unconvinced that Harriet Miers is worthy of being confirmed to the Supreme Court, according to a survey conducted by The Washington Times.
However, Miers' nomination is unlikely to fail. Captain Ed writes,
The Gang of 14, those "moderate" Senators who hijacked the confirmation process last spring, have made that outcome more likely than ever by issuing an endorsement of Miers....The conservative blogosphere remains divided. Paul (Info-Theory) is forming a list of bloggers who have taken a position on the nomination. Weigh in here.This endorsement sends a signal that they find Miers not just acceptable, but as good as they can expect.
Update: I should have noted RightWingNews' excellent survey of conservative bloggers. Here is one of several interesting results:
4) If the Harriet Miers nomination is not withdrawn by President Bush, then at her confirmation hearings, would you prefer that Republican Senators:A) Vote to confirm Harriet Miers? (33% -- 26)
B) Vote against Harriet Miers? (34% -- 27)
C) I'm not sure yet. (33% -- 26)

