It is estimated that 300,000 Puerto Ricans have moved to the U.S. mainland as a result of the devastation caused by Hurricane Maria. Large parts of the island are still without electricity or safe water, so few will be moving back soon, if at all. Puerto Ricans are American citizens, so as soon as they register in Florida or any other state, they are eligible to vote. The Koch brothers know this, so they have set up a massive outreach program to help these people, and not incidentally make sure they are familiar with the Koch brothers' favorite candidates and why these would be great people to vote for. It won't be an easy sell, though. Many of these people are aware of how much the Trump administration did for Texas and Florida and how little (basically zero) it did for Puerto Rico after all three were hit by hurricanes. Many of these people have family and friends already on the mainland, and these people may explain American politics to them, possibly in a different way than the Koch brothers. Nevertheless, the ESL courses and other aid the brothers are providing may win them some friends. At present, Democrats have no comparable outreach program.