Key Republican leaders are encouraging the party's presidential candidates to rethink their decision to skip presidential debates focusing on issues important to minorities, fearing a backlash that could further erode the party's standing with black and Latino voters. The leading contenders for the Republican nomination have indicated they will not attend the "All American Presidential Forum" organized by black talk show host Tavis Smiley, scheduled for Sept. 27 at Morgan State University in Baltimore and airing on PBS. Former New York mayor Rudolph W. Giuliani, former Massachusetts governor Mitt Romney, former senator Fred D. Thompson (Tenn.) and Sen. John McCain...