SPRINGFIELD — After serving in the Illinois Senate for 14 years, Sen. Kwame Y. Raoul will step into the position as Illinois attorney general in January after cruising to an easy victory over Republican Erika L. Harold Tuesday. The Hyde Park Democrat will become Illinois’ first new attorney general in 16 years, as current Attorney General Lisa M. Madigan steps down from her post at the end of her term in January.As attorney general, Raoul will be the state’s chief legal officer, charged with enforcing …