Sen. Bill Nelson, Florida Democrat, speaks Friday in front of a painting by a Haitian artist at a Miami middle school about reconstruction in Haiti since a January 2010 earthquake there. Mr. Nelson is seeking a third Senate term this fall. (Associated Press)

Sen. Bill Nelson, Florida Democrat, speaks Friday in front of a painting by a Haitian artist at a Miami middle school about reconstruction in Haiti since a January 2010 earthquake there. Mr. Nelson is seeking a third Senate term this fall. (Associated Press)