Zero. I never visited Nazi Germany or Cambodia, either, but I studied history.
Nicargua has come a long way since the Sandinistas and the days of Iran-Contra.
It has ratified a free trade agreement with the US and is actively seeking foreign investment.
It is true that Daniel Ortega is running for President again this year, and he might just win, although the majority of the country opposes him. There are too many conservative candidates in the race, and he could win if he collects 35% of the vote in the first round of balloting.
Obviously, that would be a setback. My hope is that he comes up a little bit short, because he'd be trounced in the final election. Hugo Chavez has tried to interfere in the election and that has caused some backlash against Ortega, which is helpful. However, we are doing the same thing, and hopefully that won't backfire on us.