You may be aware that the White House has a website where you can create a petition on a particular issue. If you can gather enough support — 100,000 e-signatures within 30 days as of this writing — someone in the administration will respond to your petition. Earlier this year, for example, a petition calling for the legalization of marijuana surpassed the threshold and received this response. It wasn’t a newsworthy response, but you get the idea.
In Brazil, the Senate has something similar. So the Associação Brasileira de Ateus e Agnósticos (ATEA) decided it would be an excellent way to challenge the government on the tax exemptions given to religious institutions.