Okay, I admit it. I'm still not very good at dealing with good news. Remember the Onion video of the Obama zombies who, after devoting months of work to their candidate, enduring countless ups and downs, couldn't face the fact that he had won the election? That could have been me on the screen. Heck, it could have been you. But let's just try for a second to suspend our disbelief: After two and a half years, a group of progressive activists allied with business and political leaders has succeeded in leasing a major Boston station, WWZN (1510 AM), with a solid 50 kW signal reaching comfortably into New Hampshire, to broadcast progressive talk, starting Monday, May 4, from 6 a.