Dickinson sent a copy of his "Letters" to James Otis of Massachusetts, informing Otis that "whenever the Cause of American Freedom is to be vindicated, I look towards the Province of Massachusetts Bay". The Massachusetts House of Representatives began a campaign against the Townshend Acts by first sending a petition to King George asking for the repeal of the Revenue Act, and then sending a letter to the other colonial assemblies, asking them to join the resistance movement. Upon receipt of the Massachusetts Circular Letter, other colonies also sent petitions to the king. Virginia and Pennsylvania also sent petitions to Parliament, but the other colonies did not, believing that it might have been interpreted as an admission of Parliament's sovereignty over them. Parliament refused to consider the petitions of Virginia and Pennsylvania.