By Anthony Man Staff writer July 25, 2003 Boca Raton · Less than a week after filing to become a U.S. Senate candidate, Johnnie Byrd spent Thursday campaigning in the home county of rival Mark Foley. And some supporters of Foley, a Republican congressman from Palm Beach Gardens, came away impressed with Byrd, the speaker of the Florida House. Peter Feaman, the Boca Raton Republican Club president whose group was host to Byrd as a luncheon speaker, said the candidate's performance was so good that he would almost certainly pick up some support. "I'm not saying I'm abandoning Foley, but...