The Bush reelection campaign yesterday unveiled its first three campaign commercials showcasing Ground Zero images, angering some 9/11 families who accused President Bush of exploiting the tragedy for political advantage. "It's a slap in the face of the murders of 3,000 people," said Monica Gabrielle, whose husband died in the twin tower attacks. "It is unconscionable." Gabrielle and several other family members said the injury was compounded by Bush's refusal to testify in open session before the 9/11 commission. "I would be less offended if he showed a picture of himself in front of the Statue of Liberty," said Tom...