NEWARK, Ohio (Reuters) - Democrat John Kerry on Friday dismissed the Republican convention as "bitter and insulting" and promised to be a U.S. president who would tell Americans the truth. "Every time they open their mouths they can't tell the truth," Kerry said at a rally. "It's time for us to have a president of the United States who can look you in the eye and when he does, you know you're being told the truth." The newly combative senator from Massachusetts said he would not allow President Bush (news - web sites) or others to question his fitness for...