[JURIST] The Casa de Maryland [advocacy website] immigrant rights group filed a challenge [brief] Monday to a public referendum over a Maryland law providing in-state tuition to undocumented college students. The group filed the challenge in the Maryland Circuit Court for Anne Arundel County [official website] after opponents of the Maryland DREAM Act [text, PDF; materials] collected enough signatures to put the law to a public referendum. Casa de Maryland and eight other individuals are challenging the referendum for two…