COTTonLINE has linked to plenty of criticism of President Obama's official acts, and failure to act. I can remember very little criticism of his personal life, perhaps his love of golf and tendency to vacation - things that amount to essentially nothing.
The criticism of President Clinton was often personal, and rightly so as he apparently could not control his libido. Criticisms of Presidents Bush and Obama have almost all been directed at their policies and official actions - entirely appropriate targets for public officials.