I don't think anybody objects to Miers having an up or down vote. They just want her to be voted down.
"In an initial chat with Miers (Leahy), according to several people with knowledge of the exchange, Leahy asked her to name her favorite Supreme Court justices. Miers responded with "Warren" -- which led Leahy to ask her whether she meant former Chief Justice Earl Warren, a liberal icon, or former Chief Justice Warren Burger, a conservative who voted for Roe v. Wade . Miers said she meant Warren Burger, the sources said."
http://www.washingtonpost.com/wp-dyn/content/article/2005/10/06/AR2005100601713.html?nav=rss_nation/special