WASHINGTON -- The United States is tightening security in the face of a steady stream of intelligence indicating al-Qaida may seek to mount an attack aimed at disrupting elections, the White House said. The Department of Homeland Security is addressing the threat and has efforts under way to "ramp up security," White House press secretary Scott McClellan said Thursday. Senate Majority Leader Bill Frist told reporters that Americans should not expect a major announcement on homeland security any time soon, indicating that the nation's threat level could remain at its "elevated" level. "There's, obviously, no reason for panic, or paralysis,"...