In addtion of replacing the president if necessary is the vice president duty to

In addition to replacing the president if necessary, it's the duty of the vice president to "d. preside over the Senate", although this role is relatively insignificant now, as the Vice President is rarely there.

Ifound this on google “the change in control meant as house minority leader, pelosi was widely expected to become speaker of the house in the next congress. on november 16, 2006, the democratic caucus unanimously chose pelosi as the democratic candidate for speaker.” i hope this