But none of the GOP's top White House contenders will show up to answer the question, each citing a scheduling conflict.
Instead, viewers will see four empty lecterns on the stage as Tavis Smiley, an African American talk show host, poses questions to five lesser-known candidates: Sen. Sam Brownback (R-Kan.), former Arkansas Gov. Mike Huckabee, Rep. Duncan Hunter (R-Alpine), Rep. Ron Paul (R-Texas) and Rep. Tom Tancredo (R-Colo.).
Coming days after the Spanish-language network Univision was forced to postpone its Republican forum because it was rejected by all but one candidate -- Sen. John McCain of Arizona -- the PBS forum has touched off a debate within the GOP over whether its 2008 candidates are trampling on past efforts to draw more minority voters. (More.)