There they have visited the site of an abandoned sugar-mill and met farm workers and their families.

BBC: Cuban-Americans debate the embargo

The most widespread and powerful objection, though, has to do with the most protected of all U.S. farm products: sugar.

NPR: Central America Trade Deal a Hard Sell

The current discussion with 4 teams is to use 2 of the 4 marquee bowls (Rose, Orange, Sugar, Fiesta) as national semi-finals, and then farm the championship game out to the highest bidder.

FORBES: College Football Playoff System a Blessing, But 4-Team Structure Appears Flawed

And the recent boom in commodity prices, driven by rapid growth in demand from China (along with the diversion of corn and sugar into to alcohol production), largely explains why total support fell from 37 percent of farm income in 1986 to 18 percent in 2010.

FORBES: Guess Who's Getting Saner About Farmers; Hint: Begins with "European," Ends with "Union"