He publicly apologized. He's a dem. Incident closed, as far as the press is concerned; no over-analyzing or dragging this out like they would for a republican.
Off the radar in five days. 
But, had he been a Republican, or worse yet, a Tea Party candidate, the jokers at CNN and MSNBC would have industrial-strength tingles going up their legs for weeks!
Offered by Crusader who does not believe an apology is sufficient in this case--unless it comes with jail time.