BUENOS AIRES, Argentina (AP) — Assisted by a glittering, pink soccer ball, Lionel Messi crossed yet another frontier with his visit to the White House. Until Thursday, the global soccer superstar had been equally adept at dodging defenders on the field and political leaders, especially those in his own country of Argentina. There were questions about whether he would even appear with the rest of Inter Miami to celebrate their MLS Cup win at the White House. As the team assembled in the room, he