But a recent Mason-Dixon poll showed Hollings slightly widening his scant lead, now 48 percent to 40 percent. Both parties claim a slight edge. But, with Democrats not picking their nominee until a primary Tuesday, the race is still regarded as too close to call. Democratic-held seats in Wisconsin, Washington and Arkansas could also be vulnerable to any broad upheavals. Other polls show a comfortable lead for Feingold.
Democrats say the race has tightened but nowhere near that much.
Republican-controlled seats from Georgia, Colorado and Missouri are also in various degrees of jeopardy.