The real reason McCain doesn't officially ring in Rev. Wright (I say officially because the extremist republicans have not let up on Wright for at least a year):
Time: John McCain's campaign aides could probably answer that question for Palin. The ink on Kristol's column had barely dried before they were on the phone to political reporters declaring that the GOP nominee had long believed it would be inappropriate to raise the Wright issue. But McCain's current sensitivity is much more related to his running mate's own pastor problems than to any newfound campaign honor code.
Palin's religious background must initially have been seen as a positive to McCain campaign vetters, who assumed that her faith would appeal to the conservative base of the party that has always been suspicious of McCain. But ever since she joined the ticket in late August, the Alaska governor's various religious affiliations have caused headaches. First came reports that her pastor at the nondenominational Wasilla Bible Church was connected to Jews for Jesus, an organization that seeks to convert Jews to Christianity. Prominent Jewish leaders, including the co-chair of McCain's Jewish outreach effort, have since demanded to know whether Palin also believes that Jews must be converted. The Bible Church became an issue again when Katie Couric asked Palin about the church's promotion of a program to help gays "overcome" their homosexuality. Read more.