There was a big newsroom gathering today at ABC News headquarters to wish Ben Sherwood a happy 50th birthday. Insiders tell us the highlight was a humorous video that included a very sweet message from Sherwood’s mom in Los Angeles that brought the hard-charging news chief to tears. Sherwood’s wife Karen and young sons Will and Charlie were on hand to lead the singing and cut the Cake Boss cake which was a bust of the ABC News boss. Sherwood, who just began his third year as head of ABC News, has a thing for birthdays. He’s known to Tweet, email and give shout-outs during his morning editorial call to employees celebrating a birthday. Today, it was his turn.