After the certificates from all states are read and the respective votes are counted, the presiding officer simply announces the final result of the vote and, provided the required absolute majority of votes was achieved, declares the names of the persons elected president and vice president. This announcement concludes the joint session and formalizes the recognition of the president-elect and of the vice president-elect. The senators then depart from the House Chamber. The final tally is printed in the Senate and House journals. The Twelfth Amendment requires the House of Representatives to go into session immediately to vote for a president if no candidate for president receives a majority of the electoral votes (since 1964, 270 of the 538 electoral votes). In this event, the House of Representatives is limited to choosing from among the three candidates who received the most electoral votes for president. Each state delegation votes "en bloc" — each delegation having a single vote; the District of Columbia does not get to vote. A candidate must receive an absolute majority of state delegation votes (i.e., at present, a minimum of 26 votes) in order for that candidate to become the "president-elect". Additionally, delegations from at least two thirds of all the states must be present for voting to take place. The House continues balloting until it elects a president. The House of Representatives has chosen the president only twice: in 1801 under Article II, Section 1, Clause 3; and in 1825 under the Twelfth Amendment. If no candidate for vice president receives an absolute majority of electoral votes, then the Senate must go into session to elect a vice president. The Senate is limited to choosing from the two candidates who received the most electoral votes for vice president. Normally this would mean two candidates, one less than the number of candidates available in the House vote. However, the text is written in such a way that "all" candidates with the most and second most electoral votes are eligible for the Senate election – this number could theoretically be larger than two. The Senate votes in the normal manner in this case (i.e., ballots are individually cast by each senator, not by state delegations). However, two-thirds of the senators must be present for voting to take place. Additionally, the Twelfth Amendment states a "majority of the whole number" of senators (currently 51 of 100) is necessary for election. Further, the language requiring an absolute majority of Senate votes precludes the sitting vice president from breaking any tie that might occur, although some academics and journalists have speculated to the contrary.