Greg Nickels’ road to winning reelection to a third term as Mayor of Seattle is finally starting to get a little rocky. Yesterday, Michael McGinn, who founded the Seattle Great City Initiative in 2006, tossed his hat into the ring. And today, James Donaldson, a former center for the Seattle SuperSonics, announced that he, too, plans to challenge Nickels. Other confirmed contestants include The Stranger’s Dan Savage (who says he will resign within twenty four hours if he wins) and Norman Sigler, an executive recruiter, who is new to the political arena. If all four of them actually file, we’ll certainly have a very interesting primary this August.