Like the historic original in 1963, Glenn Beck’s commemorative march on Washington has produced a clash of perception. Marchers celebrated rather than besieged the capital, and sweet piety floated above tribal antagonisms. Responses of disbelief have mingled once again with giddy, puzzled surprise. This time, by embracing the legacy of the Rev. Dr. Martin Luther King Jr., stridently conservative speakers revived hard questions about symbolic fusion in politics. Did their words invite a rare shift in the landscape? Or did they merely paint a mirage?