Washington- Don't blame President Bush's trade ambassador. Yes, he urged Rep. Steve LaTourette to support the controversial Central American Free Trade Agreement. And LaTourette in the end did, voting with colleagues in the middle of the night and surprising scores of people who had believed him when he said he intended to vote no. But U.S. Trade Representative Rob Portman apparently is touchy about how people see his role in a matter that has blown up in LaTourette's face. And as the week ended, he let people know it. A Plain Dealer examination last week showed that the Lake County...