After persuading McDonald's, Whole Foods and Subway that they should pay an extra penny per pound for tomatoes, a farmworkers group is taking on supermarket giant Publix. The Coalition of Immokalee Workers will kick off a three-day march Friday to try to persuade the Florida-based supermarket chain to pay more for its tomatoes and to take a stand against abusive work conditions in the fields. Publix said in a statement Thursday that "the CIW's complaints should be addressed with the employers of the workers, not with retailers and their customers." Publix spokeswoman Shannon Patten said…that it wasn't the supermarket chain's role to negotiate tomato prices. [also refers to Aramark, Burger King]