Nobel-winning economist Krugman writes that Obama is one of most successful presidents . Julian Zelizer : The New York Times reports on the growing gap between rich and poor in America, with a new report showing how much more unequal it has become since President Obama's election. But he says it 's much too early to evaluate Obama 's overall impact . Zelizer : Decisions made by LBJ , Reagan , others were hard to fully assess for many years .
Nobel-winning economist Krugman writes that Obama is one of most successful presidents . Julian Zelizer : Obama 's policies on health care , economy , regulation could prove successful . But he says it 's much too early to evaluate Obama 's overall impact . Zelizer : Decisions made by LBJ , Reagan , others were hard to fully assess for many years .