CASH TO CRY FOR. Grassroots mobilization is not new, of course. What's novel this year is the intensity of the effort and the megabucks being spent. And thanks to the 2002 campaign finance reform law, a large chunk of this year's turnout effort is privately financed by such liberal 527s as America Coming Together (ACT). Campaign laws bar political parties and candidates from raising unlimited soft dollars. But ACT operates under no such restrictions and plans to spend $120 million on voter recruitment in 15 swing states.