SPRINGFIELD — With the field for attorney general whittled from 10 to two, the Democratic nominee is calling for a substantive debate on legal issues.Chicagoan Kwame Y. Raoul, a state senator and partner in Quarles & Brady LLP’s health group, defeated seven opponents in the primary election to secure the Democrats’ nod. He took about 30 percent of the Democrat vote, according to The Associated Press, topping a field that included former Gov. Patrick J. Quinn and former Assistant Attorney General …