Jim Packard, longtime radio sidekick to host Michael Feldman on Whad’Ya Know?,” is retiring at the end of January. He’s also a familiar voice to Wisconsin Public Radio listeners; he’s been there since 1981. So the popular show is searching for a new (temporary) Packard, literally, with its “Being Jim Packard” contest. (“If you can say . . . ‘That’s One Right’ you could be me on Whad’Ya Know? for one fabulous day. To quote Michael, you could get in on the ground floor of radio and stay there, much as I have.”) Entries are due Jan. 12, 2011, and the winner will be announced on the Jan. 15 show.