Sen. Marco Rubio delivered an aggressive Republican rebuttal to President Obama’s State of the Union address Tuesday night, launching a full-throated defense of limited-government conservatism.Rubio accused the president of an “obsession” with hiking taxes, defended the GOP belief in the free market, and cast Republicans as the real defenders of the middle class.“More government isn’t going to help you get ahead. It’s going to hold you back,” Rubio said. “More government isn’t going to create more opportunities.”