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(the third withdrew herself because of Democratic opposition -- or, to use your vernacular, obstructionism)
No, that is hilariously wrong. Harry Reid actually supported Miers, though many Democrats did not. The real problem for Bush and Miers, though, was the reaction from conservatives. Wikipedia:
The nomination almost immediately drew criticism, virtually all of it from within the President's own party: David Frum castigated an "unforced error",[1] and Robert Bork denounced it a "disaster" and "a slap in the face to the conservatives who’ve been building up a conservative legal movement for the last 20 years."
Notable conservative commentators expressing [...] concerns included newspaper columnists Pat Buchanan, Ann Coulter,[28] Charles Krauthammer,[29] William Kristol,[30] Rush Limbaugh, Ramesh Ponnuru, and George Will;[31] former Bush speechwriter David Frum; and constitutional scholar Randy Barnett.