Tuesday, April 4, 2006 1:00 p.m. EDT Hillary Clinton in Senate Poll Plunge Support for Sen. Hillary Clinton's reelection bid has suddenly plunged precipitously, with her lead over GOP challenger, former Yonkers Mayor John Spencer, dropping by 10 points, according to the latest Zogby poll. In Zogby's January survey, Mrs. Clinton led Spencer among New Yorkers surveyed by a whopping 31 points, 61 to 30 percent. Quinnipiac and Marist College surveys taken in the intervening months have echoed that result. But in a Zogby poll released Monday, Mrs. Clinton's lead had suddenly plummeted to 21-points, showing her with 54 percent...