Cover-Up Issue Is Seen as Focus in Leak Inquiry By DAVID JOHNSTON WASHINGTON, Oct. 20 - As he weighs whether to bring criminal charges in the C.I.A. leak case, Patrick J. Fitzgerald, the special counsel, is focusing on whether Karl Rove, the senior White House adviser, and I. Lewis Libby Jr., chief of staff for Vice President Dick Cheney, sought to conceal their actions and mislead prosecutors, lawyers involved in the case said Thursday. Among the charges that Mr. Fitzgerald is considering are perjury, obstruction of justice and false statement - counts that suggest the prosecutor may believe the evidence...