Rick Santorum has issued a very cautious statement on Miers:

Washington, D.C. – U.S. Senator Rick Santorum (R-PA), Chairman of the Senate Republican Conference, issued the following statement regarding President George W. Bush’s nomination of Harriet Ellan Miers to serve as Associate Justice of the Supreme Court.
“As the Supreme Court opens its session, I am pleased that the President has named his choice to replace Justice O’Connor. I intend to carefully review the nominee’s credentials and assess her qualifications and commitment to the rule of law.”
“I look forward to learning more about Ms. Miers’ background in the days and weeks to come and it is my hope that she will be treated with dignity and respect as were previous nominees throughout this process.”