Bostonians' sweeping concerns over gridlock and other Democratic National Convention week headaches have been overblown by a ``mean-spirited'' media, Sen. John Kerry's daughter Alexandra said. ``I think it's sad that that's something that's been perpetuated in the press,'' Kerry's daughter told reporters during a conference call yesterday. ``I think sometimes the press likes to perpetuate controversy. Some of it has been mean-spirited.'' Kerry said she's heard her father talk about the massive road closures and other security woes. Still, the tight-knit clan is looking forward to the July 26-29 Democratic shindig at the FleetCenter. ``I think it is a positive...