Charter schools are a subterfuge aimed at destroying the public school system that made our nation great, all in the name of "small government". In reality, the owners of charter schools get guaranteed government contracts that come directly out of local funding for education. They are a manifest ripoff, and the outfit behind it is more than likely just another astroturf group funded by the self-same millionaires who stand to profit handsomely from them. See e.g. Barbara Madeloni's (president of the Massachusetts Teachers Association) comments in the recent Globe article,
https://www.bostonglobe.com/metro/2015/09/22/baker-lift-charter-school-cap/pWLQnrofqH6EmpAFs5gSeN/story.html
For more on the abomination of charter schools more generally, see
http://www.alternet.org/election-2014/who-profiting-charters-big-bucks-behind-charter-school-secrecy-financial-scandal-and