Let's hope this doesn't get turend political and the GOP tries to block it. It'd be very hypocritical of them seeing as Romney has expressed support for statehood. (HEck, even Reagan expressed support in the 80s.)
See those are the only sources I've found so far. I've also found something from FoxNews saying the same as your first article. I have also found sites from Puerto Rico also having similar statistics to the first.
I ahve not found anything to confirm or deny this so far. but yes, that is also where I have heard that Reagan and Obama have supported it. (I recall Obama saying something during his campaign.)