Presidential candidate Rand Paul often brags that he goes to places other Republicans tend to shun, such as Democratic cities like Detroit and historically black colleges. But these days he's going really far afield.

This week, instead of joining other 2016 candidates at the Iowa State Fair, he went to Haiti. An ophthalmologist, Mr. Paul has been performing pro bono eye surgeries rather than seeking U.S. votes for his struggling presidential campaign.

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