<Tr> <Th> </Th> <Th>% Dem </Th> <Th>% GOP </Th> </Tr> <Tr> <Td> Immigrant groups </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Irish Catholics </Td> <Td> 80 </Td> <Td> 20 </Td> </Tr> <Tr> <Td> All Catholics </Td> <Td> 70 </Td> <Td> 30 </Td> </Tr>

A primary factor in the growth of the new republican party was its