Did Obama reverse Clinton's welfare reforms and cause the biggest increase in welfare in history?

The simple answer is no. Reading between the emotionally loaded words and the political spin in the articles, the stimulus package is increasing the share the feds are going to pay to 80% but those already on the rolls are not going to be grandfathered in so the new cost sharing plan will only apply to new enrollees. Federal-State cost sharing is being revised because the economy has drained the states' treasuries. All the other provisions of the Clinton era welfare reforms will remain in place so relax. No lazy, worthless, destitute women and their hungry children will get a nickel more of your money than they are currently getting. It'll just be coming from a different source.