The constitution contains a bill of rights in itself, but its preamble mentions the principles the government of Oklahoma is to uphold. The constitution's preamble states that the state government is to: ... secure and perpetuate the blessing of liberty; to secure just and rightful government; [and] to promote our mutual welfare and happiness ... Among these foundational principles protected by the Oklahoma bill of rights are: political power derives from the consent of the people; the people have the inherent rights to life, liberty, the pursuit of happiness, and the enjoyment of the gains of their own industry; the right to peaceful assembly; a ban on the interference with suffrage; the definition of treason; the right to trial by jury; and that marriage in the State of Oklahoma is defined as being between a man and a woman. Legislative branch The legislative branch is the branch of the Oklahoma state government that creates the laws of Oklahoma. The Oklahoma Legislature, which makes up the legislative branch, consists of two chambers: the Senate and the House of Representatives. The state legislature has the power to levy and collect taxes, borrow money, and raise and maintain the militia of the state. The constitution grants the state legislature the authority to legislate on "rightful subjects" of legislation. The Oklahoma Legislature meets for four months in regular session each year from February to May. However, under special circumstances, the governor or two-thirds of the state legislature's membership can call special sessions. The governor has a strong influence in shaping the agenda of the legislature. Legislation must be approved by a majority in both houses and signed by the governor to be enacted into law. However, should the governor veto the bill, the legislature, by a two-thirds vote in both houses, may overturn the governor's veto, and the bill be enacted into law without the governor's signature. On appropriations bills, however, the governor has a line-item veto. Under the Oklahoma Constitution, members of both houses enjoy the privilege of being free from arrest, except for treason, felony, and breach of the peace. This immunity applies to members during sessions and when traveling to and from sessions. The constitution also guarantees absolute freedom of debate in both houses, providing, "for any speech or debate in either House, shall not be questioned in any other place." Members of the legislature are limited to a combined total