BROWNSVILLE, March 7, 2004 — Before Brownsville physician Dr. Jesus Antonio Caquias or Ingleside Mayor Willie Vaden can try to unseat U.S. Rep. Solomon Ortiz, they have to contend with one another first. Caquias and Vaden are running for the Republican nomination for U.S. District 27, which includes much of Cameron County and parts of Nueces, Kleberg and Willacy counties. The winner of the election on Tuesday will face Ortiz, D-Corpus Christi, on Nov. 2. Also running for the District 27 seat are Libertarian candidates Christopher J. Claytor of Plano and Frank Jones III of Ingleside. Vaden, Ingleside’s mayor since...