 AT A RALLY IN PENNSYLVANIA. AND ON THE SAME DAY, THE REPUBLICAN NATIONAL CONVENTION KICKS OFF. AND SECURITY THERE IS A CONCERN. ED O'KEEFE IS IN MILWAUKEE. THIS CONVENTION, LIKE THE DEMOCRATIC CONVENTION LATER THIS SUMMER, ARE CLASSIFIED A NATIONAL SPECIAL SECURITY EVENT. THE SECRET SERVICE HAS BEEN AT WORK FOR MORE THAN 18 MONTHS WITH LOCAL AND STATE OFFICIALS GETTING READY FOR THIS. CBS NEWS SPECIAL REPORT. I'M CAMI MCCORMICK.