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By Katie Kerwin McCrimmon The U.S. Supreme Court will hear an unprecedented five hours of oral arguments on the constitutionality of the Affordable Care Act early next year and should rule by next summer in the midst of the 2012 presidential campaign. Colorado is one of 25 states that have joined Florida and the National Federation of Independent Business in challenging the Affordable Care Act. The justices could invalidate the most controversial part of the law, the individual mandate, which requires all individuals to buy health insurance. Legal scholars and lower court judges have opposing views on whether the individual…