Palmeiro hits No. 500 05/12/2003 By SEAN HORGAN and BILL CAMPBELL / The Dallas Morning News ARLINGTON – Rafael Palmeiro now walks with baseball's giants. The Texas Rangers first baseman became the 19th member of one of baseball's most exclusive clubs Sunday when he slugged his 500th home run in the seventh inning of the Rangers' 17-10 victory against the Cleveland Indians at The Ballpark in Arlington. The home run came off Cleveland pitcher David Elder, who has the ignominious distinction of surrendering one of baseball's historic home runs. It leaves Palmeiro four homers behind Eddie Murray, the hitting coach...