I heard two-thirds of legal immigrants vote for democrats.
I remember back in 1996 when Bill Clinton rushed to give citizenship to recent legal immigrants. The republicans complained that background checks were not conducted on these recent immigrants, but Clinton blew off the GOP....he knew that two out of three would vote for him in the November 1996 election.
When JFK became president the democrats had only won the non-Catholic Christian vote, twice, once for FDR in 1932, and then for FDR in 1936, and that was it, JFK devoted his political life to replacing the traditional population of America, with a population that would vote for his party.
Today, the democrat party depends on a coalition of those non-Protestant voters.