By Yael T. Abouhalkah, Kansas City Star Editorial Page columnist

Don't envy President Barack Obama as he tries to keep VP Joe Biden's lips zipped.

At a swearing-in ceremony Wednesday for senior White House staff members, Biden joked about Chief Justice John Roberts' flubbing of the inaugural oath on Wednesday.

A tight-lipped Obama looked on as Biden made his comments, which drew a few oohs and ahhs from the crowd of staff.

Obama didn't smile at Biden's remarks. He even moved to push Biden to get to the podium and get on with the task at hand.

Watch the video here.

I'm encouraged by Obama's actions Wednesday. They indicate he wants to be serious when necessary, and not make jokes at others' expenses when unnecessary.