Yeah, the Cuba restrictions are part of the long-running Embargo that was supposed to help unseat Fidel Castro after his communist regime deposed Batiste close to fifty years ago.
It's taken almost five decades, but by golly, it's finally working! It looks like Fidel Castro will no longer be in charge of the government of Cuba!
When you think about it, it's really an odd political stand when you consider we've pretty much normalized relations with Viet Nam, despite the brutal conflict we were engaged in with them for over ten years. We've not been engaged in a shooting war with Cuba since the Spanish American War in the 1800s, and Castro's government is by no means more vicious than many of the regimes we do have diplomatic arrangements and regular trade/tourism with.
Some expected Cuba to crumble when the Soviet Union collapsed, since part of what bolstered Cuba in defiance of the U.S. Embargo was Soviet support. It's been some 20 years since the USSR disbanded, and Cuba still hasn't crumbled.
Whether the Castro regime needs to go away or not, it should be pretty clear at this point that the U.S. Embargo isn't going to make it happen. IMNSHO, it's about time we rethink the strategy, and consider we might have a more positive effect on freedom and human rights in Cuba by opening up to them, rather than snubbing them.
BTW, this isn't a partisan political rant. Every President since JFK, both Democrat and Republican, has continued to maintain the embargo. I don't think any major candidate wants to alienate the U.S. Cuban population by seeming to be soft on the Castro government.