Rick Morrissey just did the unthinkable, jumping from the Tribune to the Sun-Times because the opposition felt to him like a more exciting place to be. That used to happen in the late 60s and early 70s, when both papers prospered but the Sun-Times was the young, hard-charging one. But since Rupert Murdoch took over the Sun-Times in 1984 the traffic’s been almost all the other way — the Tribune was the more respectable paper, the more prosperous and secure paper, and lately, when the Sun-Times and Tribune both found themselves in bankruptcy, the paper more likely to go under last because the water would take longer to reach the rail.