Scott Walker has called a press conference in Madison at 6:00 P.M. EDT.  It is widely expected that he will announce that he is withdrawing from the race for the Republican nomination for President.  Walker, an early favorite of many conservatives, who once led the field in the polls – especially in the crucial early caucus state of Iowa – has dropped to less than 1% in the last CNN poll.  If he quits, he will be the second Republican to drop from the race.  Rick Perry announced his withdrawal from the race on September 11th.