Suddenly, Hillary Clinton has not one but two anti-war challengers in the 2006 Senate race. Cheered on by none other than "Peace Mom" Cindy Sheehan, the anti-war movement has been hounding Clinton for voting to support the war in Iraq and refusing to demand the immediate withdrawal of troops. Now the movement has a pair of candidates pledging to dog Clinton throughout the Democratic primary, forcing her to keep explaining her vote on Iraq. The first is Steven Greenfield of New Paltz, a musician and volunteer firefighter who's set to make his candidacy official Monday morning at a press conference...