A coalition of activists is planning to protest The King Center’s choice of the Rev. Rick Warren as keynote speaker on the federal observance of the Rev. Martin Luther King Jr.’s birthday. The Jan. 19 event in Georgia is the day before the inauguration of President-elect Barack Obama, who has chosen Warren to give the inaugural invocation. Warren had backed the recent Proposition 8 ballot measure banning same-sex marriage in his home state of California…

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