A group headed by a former state lawmaker is attempting to rally charter school systems throughout the state to band together under one flag to share ideas and petition legislators.On Monday, the Gainesville City Schools Board of Education broached the subject of joining, potentially, 15 other systems as members of the Charter System Foundation, an initiative of Dan Weber, a former state senator who was chairman of the Senate Education and Youth Committee.The foundation, Weber said, would allow for “collaboration between our charter systems ... and (would) support and promote the efforts of charter systems.”Weber said he approached Lt. Gov. Casey Cagle about eight months ago to establish a foundation to do just that. Since then, Weber has been communicating with the 16 established charter systems in the state to ask for their support — and money.The foundation’s main function, Weber said, is to provide an avenue for charter systems to share information, training and best practices.