Oh dear. It’s time once again for the awkward, occasionally humiliating ritual that is the annual Funniest Celebrity in Washington Contest. The very notion that Washington has “celebrities” who are in any measurable way “funny” is hard enough to swallow, but this year’s line-up looks to be stacked with even more potential for cringe-worthy one-liners than usual. Former presidential candidate and Arkansas Gov. Mike Huckabee and Libertarian presidential candidate Bob Barr top the bill of…