Chicago Sun-Times political columnist Robert Novak has some bad news for Sen. Hillary Rodham Clinton: You've lost momentum. According to Novak, a national poll of Democratic voters shows that support for a presidential candidacy for Sen. Barack Obama has surged while Clinton is treading water. Republican pollster John McLaughlin questioned voters on Election Day in both 2004 and 2006 and discovered support for Clinton, D-N.Y., unchanged at 27 percent. Sen. John Kerry, who was second in 2004 at 16 percent, got only 8 percent this year. Meanwhile, Obama attracted 21 percent, up from 2 percent in 2004. In the GOP...