Barack Obama plans a major speech tomorrow in Philadelphia on race, Rev. Jeremiah Wright and the future.

An adviser said that Obama wants to contain the Wright story. He worries that the 1960s-to-1980s prism of race is what everyone has read into it, and Obama wants to move the discussion forward.

He is expected to recount, in detail, how he came to know Rev. Wright, how he came to admire Rev. Wright, the history and meaning of the Trinity church, and address the controversial remarks attributed to Wright.

He is also worried that Wright and church will get caricatured unfairly.

Politically, Obama wants lead his defense, believing that surrogates might either inflame the controversy by defending Rev. Wright or describe imprecisely Obama's view of race relations. (Is he post-racial? Trans-racial?)

Since everyone is paying attention to Obama and race, the basic thought, according to advisers, is why not give a big speech about... Obama and race.