It basically means "May God grant that!" though it's usually used in a non-belief sense. (Kind of like when I stub my toe as an atheist and yell "Goddammit!"
I've lived in a lot of places over the past 10 years where charters were being utilized: Hartford, Philadelphia, NYC, DC, Baltimore, Montgomery and Anne Arundel counties in MD, Yonkers. Before that, I worked as a literacy activist for an urban literacy coalition where part of our purview had a do with family literacy and literacy education from Kindergarten through adult. My honest professional opinion is that charter schools are evil--worse than private or parochial education in so far as at-least private education is not a vampire upon the public education system stealing its resources and even in many places misappropriating their buildings. If Democrats and liberals have mis-stepped in public education, it is in not opposing charter education with every ounce of our being as what it really is...another attempt to destroy public education.