I must confess that I regard "Blacks and Hispanics" as lost causes, and I don't know why. The closest thing that I can guess (and I am a Noachide, so prepare to perhaps be offended) is that Blacks and Hispanics worship a Black/Hispanic J*sus with completely different priorities, and that white chr*stians worship a "white" (or at least "patriotic American") J*sus. That's one of the inherent problems of making G-d into a man (chas veshalom!).
I don’t know how to reach black voters, they reversed themselves in one election in 1936, and never looked back, and I don’t know how to reach Catholic Hispanics, both of those groups will never be conservative.
Seeing that Protestant Hispanics voted 44% for Bush against a sitting veep in 2000, and then 56% to reelect Bush in 2004, and then went 52% for Obama in the racial tsunami of 2008, gives me hope. Catholic Hispanics went 33%, 33%, 32% Republican in those elections, they are not in play.
There is no question that the 32% of the Hispanic vote that is Protestant is in play, that means that we can fight for them and that also means that they can have some influence with their less conservative Catholic, fellow Hispanics, as white Protestants influence white Catholics.
If we can see the type of movement among Hispanic Catholics that we have seen with white Catholics in the last 30 years, then we could perhaps start dependably winning the overall Catholic vote by a narrow margin.
It is never truly over.