INDIANAPOLIS | Hillary Clinton's campaign on Friday accepted Gary Mayor Rudy Clay's invitation to debate Barack Obama on urban issues in the struggling Steel City -- only to have the mayor promptly rescind the offer he had extended a day earlier. The Democratic presidential contenders squared off for two hours Wednesday night in Philadelphia. But the first half of the ABC News debate was dominated by what Obama decried as "gotcha" issues, including Obama's characterization of "bitter" small town voters and Clinton's faulty recollection of coming under sniper fire during a 1996 visit to Bosnia. Clay, an Obama supporter, said...