<Tr> <Td_colspan="30"> Charleston presidential ballot </Td> </Tr> <Tr> <Th> Ballot </Th> <Th> 51st </Th> <Th> 52nd </Th> <Th> 53rd </Th> <Th> 54th </Th> <Th> 55th </Th> <Th> 56th </Th> <Th> 57th </Th> </Tr> <Tr> <Th> Douglas </Th> <Th> 151.5 </Th> <Th> 151.5 </Th> <Th> 151.5 </Th> <Th> 151.5 </Th> <Th> 151.5 </Th> <Th> 151.5 </Th> <Th> 151.5 </Th> </Tr> <Tr> <Th> Guthrie </Th> <Th> 65.5 </Th> <Th> 65.5 </Th> <Th> 65.5 </Th> <Th> 61 </Th> <Th> 65.5 </Th> <Th> 65.5 </Th> <Th> 65.5 </Th> </Tr>

What caused some delegates to walk out of the democratic convention in charleston south carolina