Obama calls on his Internet campaign army to march again WASHINGTON — President-elect Barack Obama's 3 million campaign volunteers got re-enlistment notices this week. Campaign manager David Plouffe, in a mass e-mail sent Wednesday to former workers, asked how much time they can spare for four missions integral to Obama's effort to transform his victory into a broader political movement. The volunteers' options are, Plouffe wrote: Campaign for progressive state and local candidatesUndertake grassroots local efforts to advance Obama's agendaTrain others in Obama's organizing techniquesFocus on local political issues. "Obama's building a political machine," said Stephen Hess, a presidential scholar...