 
 <translate> Use stream of consciousness to answer the following. The U.S. Constitution also provides for appointment of one of the elected Senators to serve as President pro tempore. This Senator presides when the vice president was absent from the body. The President pro tempore is selected by the body specifically for the role of presiding in the absence of (as the meaning of pro tempore, literally "for the time being") the actual presiding officer. By tradition, the title of President pro tempore has come to be given more-or-less automatically to the most senior senator of the majority party. In actual practice in the modern Senate, the President pro tempore also does not often serve in the role (though it is his or her constitutional right to do so), instead, as governed by the aforementioned Rule I, he or she frequently designates a junior senator to perform the function.

Answer this question based on the passage: who is the backup leader of the senate? <hau> Yi amfani da rafi na sani don amsa wadannan. Har ila yau, Kundin Tsarin Mulki na Amurka ya ba da izinin nada ɗaya daga cikin Sanatocin da aka zaɓa don yin aiki a matsayin shugaban kasa na wucin gadi. Wannan Sanata ne ke jagorantar lokacin da mataimakin shugaban kasa bai halarci taron ba. Shugaban na wucin gadi an zaba shi ne ta hanyar jiki musamman don rawar shugabancin ba tare da (kamar yadda ma'anar pro tempore, a zahiri "a halin yanzu") ainihin jami'in da ke shugabancin ba. Ta al'ada, an ba da taken shugaban kasa na wucin gadi fiye da ƙasa ta atomatik ga babban sanata na jam'iyyar da ta fi rinjaye. A ainihin aiki a cikin Majalisar Dattijai na zamani, Shugaban pro tempore kuma ba sau da yawa yana aiki a cikin rawar (duk da cewa hakkinsa ne na tsarin mulki ya yi haka), a maimakon haka, kamar yadda aka tsara ta hanyar Dokar I da aka ambata a baya, shi ko ita sau da yawa yakan sanya dan majalisar dattijai don yin aikin.  Amsa wannan tambaya bisa ga nassi: wanene shugaban majalisar dattijai na baya? 