A march for education will begin at Raley Field March 16 and end at the Capitol, where a crowd of thousands of students, teachers, administrators is expected to recognize the importance of affordable education for all.   Students and teachers are hopeful their voices will be heard. Instructors throughout the Los Rios Community College District are encouraging their students to get out there on Monday at 10 a.m. for the beginning of the march.   “Community colleges are the backbone, especially in a bad economy, for students,” says Sacramento City College political science professor Paul Frank. “If community college students stop being political, they’re going to lose whatever they have or