Role and powers
States are semi-sovereign republics under the federal government of the United States, and possess a number of powers and rights under the United States Constitution, such as regulating intrastate commerce, holding elections, creating local governments, and ratifying constitutional amendments. Each state has its own constitution, grounded in republican principles, and government, consisting of three branches: executive, legislative, and judicial. Also, due to the shared sovereignty between each state and the federal government, Americans are citizens of both the federal republic and of the state in which they reside.
The governor heads the government's executive branch in each state or territory and, depending on the individual jurisdiction, may have considerable control over government budgeting, the power of appointment of many officials (including many judges), and a considerable role in legislation. The governor may also have additional roles, such as that of commander-in-chief of the state's National Guard (when not federalized) and of that state's respective defense force (which is not subject to federalization). In many states and territories the governor also has partial or absolute power to commute or pardon a criminal sentence. All U.S. governors serve four-year terms except those in New Hampshire and Vermont, who serve two-year terms.
In all states, the governor is directly elected, and in most cases has considerable practical powers, though this may be moderated by the state legislature and in some cases by other elected executive officials. In the five extant U.S. territories, all governors are now directly elected as well, though in the past many territorial governors were historically appointed by the President of the United States. Governors can veto state bills, and in all but seven states they have the power of the line-item veto on appropriations bills (a power the President does not have). In some cases legislatures can override a gubernatorial veto by a two-thirds vote, in others by three-fifths.
In Alabama, Indiana, Kentucky, and Tennessee, the governor's veto can be overridden by a simple majority vote, making it virtually useless. In Arkansas, a gubernatorial veto may be overridden by an absolute majority. The Governor of North Carolina had no veto power until a 1996 referendum. In 47 of the 50 states, whenever there is a vacancy of one of the state's U.S. Senate seats, that state's governor has the power to appoint someone to fill the vacancy until a special election is held; the governors of Oregon, Alaska, and Wisconsin do not have this power.
A state governor may give an annual State of the State address in order to satisfy a constitutional stipulation that a governor must report annually (or in older constitutions described as being "from time to time") on the state or condition of the state. Governors of states may also perform ceremonial roles, such as greeting dignitaries, conferring state decorations, issuing symbolic proclamations or attending the state fair. The governor may also have an official residence (see Governor's Mansion).
In a ranking of the power of the governorship in all 50 states, University of North Carolina political scientist Thad Beyle makes the distinction between "personal powers" of governors, which are factors that vary from person to person, season to season - and the "institutional powers" that are set in place by law. Examples of measurable personal factors are how large a governor's margin of victory was on election day, and where he or she stands in public opinion polls. Whether a governor has strong budget controls, appointment authority, and veto powers are examples of institutional powers.