In a region stung by layoffs and the pullout of a major employer, comedian Jay Leno was good for a few laughs. The host of "The Tonight Show" put on a free stand-up performance Sunday for 4,000 people as part of his "Comedy Stimulus" tour. "I don't think Jay Leno can do anything about our local economy or the situation here, but at least he empathizes with us," said John Porter, of Wilmington. "He realizes there is something big going on here and it could get a lot bigger." Leno, during an interview between shows, said he visited Wilmington because he knew the area has suffered an economic blow and many people didn't have the money for entertainment.