made the region of Maine, long part of Massachusetts, a free state to balance the pending admission of slave state Missouri. In addition, Pennsylvania, Tennessee and Mississippi also cast one fewer electoral vote than they were entitled to, as one elector from each state died before the electoral meeting. Consequently, this meant that Mississippi cast only two votes, when any state is always entitled to a minimum of three. This is one of only three times a state or district has cast under the minimum of three electoral votes, the others being Nevada in 1864 and the District of Columbia in 2000. In the case of the former, an elector was snowbound and there was no law to replace him (Nevada had only become a state that year). In that of the latter, a faithless elector abstained from voting. Alabama, Illinois, Maine, Mississippi and Missouri participated in their first presidential election in 1820, Missouri with controversy since it was not yet officially a state (see below). No new states would participate in American presidential elections until 1836, after the admission to the Union of Arkansas in 1836 and Michigan in 1837 (after the main voting, but before the counting of the electoral vote in Congress). Nominations Democratic-Republican Party nomination Only fifty of the one hundred ninety-one Democratic-Republican members of the United States Congress attended the nominating caucus and they unanimously voted to not make a nomination as it would be unnecessary to do so. Monroe and Tompkins appeared on the ballot with the support of the Democratic-Republican Party despite not being formally nominated. General election Campaign Effectively there was no campaign, since there was no serious opposition to Monroe and Tompkins. Disputes On March 9, 1820, Congress had passed a law directing Missouri to hold a convention to form a constitution and a state government. This law stated that "the said state, when formed, shall be admitted into the Union, upon an equal footing with the original states, in all respects whatsoever." However, when Congress reconvened in November 1820, the admission of Missouri became an issue of contention. Proponents claimed that Missouri had fulfilled the conditions of the law and therefore was a state; detractors contended that certain provisions of the Missouri Constitution violated the United States Constitution. By the time Congress was due to meet to count the electoral votes from the election, this dispute had lasted over two