Leaders from six progressive groups participating in the “Take Back America” conference this week announced Tuesday that they would undertake the largest and most expensive effort in history to push progressively minded Americans to the polls.

“2008 has the potential to be a ‘sea-change' election,” said Robert Borosage, co-director of the Campaign for America's Future, the organization that hosts the annual conference. Borosage predicted a political transformation on the order of the conservative realignments that swept through the nation following Ronald Reagan's election in 1980.