Democratic Sen. Joe Biden, a White House hopeful, said Thursday that the al-Qaida terrorist network clearly wants to strike the United States again, perhaps with an attack on the scale of Sept. 11, 2001. "I believe they're planning something as large and complex as 9/11," Biden told an audience at the National Press Club four days before the fifth anniversary of the attacks. "If you look at their modus operandi, that's how they have proceeded. That's how they have worked. And, I believe that's what they're doing," said Biden, the top Democrat on the Senate Foreign Relations Committee. "We have...