Miami expects presidential visit Event may be linked to Cuban holiday BY CAROL ROSENBERG crosenberg@herald.com President Bush is expected in Miami for a Republican fundraiser May 20 -- Cuba's 100th Independence Day -- and White House image-makers are considering presidential stops ranging from a Little Havana rice-and-beans lunch to an anti-Castro rally. Officially, the White House is mum on the visit. ''We haven't made any announcements about May 20th,'' spokeswoman Jeanie Mamo said this week, in keeping with long-standing policy of not divulging plans too early. Secret Service concerns or world events could derail them. Behind the scenes, however, politicians...