Under the current system, the boundaries are only ever two years out of date. The New Jersey Constitution provides that each Legislature is constituted for a term of two years, split into two annual sessions. Because the Constitution also specifies that all business from the first year may be continued into the second year, the distinction between the two annual sessions is more ceremonial than actual. The two-year legislative term begins at noon on the second Tuesday in January of each even-numbered year. For example, the two-year term of the 215th Legislative session began on noon on Tuesday, January 10, 2012. At the end of the second year, all unfinished business expires. Service in the Legislature is considered part-time, and most legislators have other employment. In New Jersey, legislators may also concurrently hold another elected office at the county or municipal level. The practice, which is frequently referred to as "double dipping", has recently been banned by the Legislature, although the 19 legislators holding multiple offices as of February 1, 2008 were grandfathered into the system. As of January 2013, only 4 legislators remain grandfathered into the system. The General Assembly is headed by a Speaker, while the Senate is headed by a President. Each house also has a Majority Leader, a Minority Leader, assistant Leaders, and whips. The members of the New Jersey Legislature are chosen from 40 electoral districts. Each district elects one Senator and two Assemblymen. New Jersey is one of only seven U.S. states (with Arizona, Idaho, Maryland, North Dakota, South Dakota, and Washington) in which districts for the upper and lower house of the legislature are coterminous. Districts are redefined decennially by the New Jersey Apportionment Commission following each U.S. Census, as provided by Article IV, Section III of the State Constitution. The sitting Legislature is the 218th Legislature of the State of New Jersey. Currently, the Democrats are the majority party in both Houses. In the Senate there are 25 Democrats and 15 Republicans. There are 54 Democrats and 26 Republicans serving in the General Assembly. The senate is the upper house in the New Jersey legislature. Currently, 40 people serve in the Senate for two years after redistricting, followed by four-year terms. The general assembly is the lower house of the New Jersey legislature. Currently, 80 people are in the New Jersey legislature for two-year terms.