Democrats have their political convention this week in Charlotte , North Carolina . Opinion : Julian Zelizer says it 's vital that Democrats respond to the charges made by the GOP . He says Democrats ca n't go on blaming Bush or warning what a Romney White House would do . Zelizer : Obama will strongly defend his record , including stimulus , health care law .
Democrats have their political convention this week in Charlotte , North Carolina . Julian Zelizer says it 's vital that Democrats respond to the charges made by the GOP . He says Democrats ca n't go on blaming Bush or warning what a Romney White House would do . Zelizer : Obama will strongly defend his record , including stimulus , health care law .