<Tr> <Th> 8 </Th> <Td> David Rice Atchison </Td> <Td> President pro tempore of the Senate </Td> <Td> Democratic </Td> <Td> December 20, 1852--March 4, 1853 </Td> <Td> Elected President pro tempore </Td> <Td> Fillmore </Td> </Tr> <Tr> <Th> 9 </Th> <Td> David Rice Atchison </Td> <Td> President pro tempore of the Senate </Td> <Td> Democratic </Td> <Td> April 18, 1853--December 4, 1854 </Td> <Td> Death of Vice President William R. King </Td> <Td> Pierce </Td> </Tr> <Tr> <Th> 10 </Th> <Td> Lewis Cass </Td> <Td> President pro tempore of the Senate </Td> <Td> Democratic </Td> <Td> December 4, 1854--December 5, 1854 </Td> <Td> Elected President pro tempore </Td> <Td> Pierce </Td> </Tr> <Tr> <Th> 11 </Th> <Td> Jesse D. Bright </Td> <Td> President pro tempore of the Senate </Td> <Td> Democratic </Td> <Td> December 5, 1854--June 9, 1856 </Td> <Td> Elected President pro tempore </Td> <Td> Pierce </Td> </Tr>

Where does it say that the vice president is next in line if something happens to the president