State legislatures normally have had only very few, basic constitutional procedural requirements regarding the passage of legislation. Most state constitutions stipulate that laws can be enacted only after bicameral passage of identical measures, followed by presentment to the chief executive. There may also be requirements that bills receive “readings” on three or more legislative days before passage. Practically speaking, most legislative procedure is determined by internal rules of each chamber. These rules refer to bill referral to committees, methods of bringing bills to the chamber floor, procedures for disciplining members, etc.

Many of the early state constitutions did not provide a means by which the governor could block legislation through a veto. This reflected an anti-executive power bias that carried over from the opposition to the king in colonial times. Gradually, however, the powers of governors increased, and among the most important powers of the governor was the power to veto. In the 1990s, North Carolina’s governor was the last to gain the veto power. The veto power varies dramatically among the states, particularly regarding which measures are subject to veto and the ease with which the legislatures can override the veto. Many states now permit an item veto for appropriation bills, but not for other legislation. Proposed constitutional amendments approved as joint resolutions by the legislature cannot be vetoed by the governor, but instead in most states today go to the electorate for approval. In several states vetoes can be overridden by margins much smaller than the two-thirds requirement necessary for overriding presidential vetoes. In some states, only a simple majority of those elected to serve in each chamber is needed to override the governor’s veto.