President Barack Obama on Thursday will unveil a broad plan to lower the cost of college, the highlight of which involves a new ratings system that ties the federal government's allocation of financial aid to the ratings system. Obama's plan would instruct the Department of Education to rank colleges with their peers, according to new measures that evaluates their success and affordability. Some of these measures, according to the White House, include the following: * Access, such as percentage of students receiving Pell grants; * Affordability, such as average tuition, scholarships, and loan debt; and * Outcomes, such as graduation...