You have to take a deep breath to recite the full name of the newest organization in town: Gov. George W. Bush Presidential Exploratory Committee, Inc. It is up and running, with faxes and phones and all that stuff. Also well underway is the phase where the candidate gets fawning magazine, newspaper and television stories — the media equivalent of hanging up a piñata before the big party. It’s nice, big, eye-catching, room-dominating, and the bats will come out as soon as everyone arrives.