The federal government paying off Puerto Rico's debt and making it a state would be a huge win for Republicans if it was them that passed it. Puerto Rico would become a lot more R-leaning, and probably be Safe R for a generation.
No, but it would be worth a few points in Florida. PR would be a safe Dem state with 8 to 10 EV's though.
Not that many. If they had been a State, PR would have had 8 EV in the 2000 apportionment but then gone down to 7 EV in 2010. Even without Maria, they were on track to go down to 6 in 2020, and now that looks to be certain.