^ Pretty sure those are Orthodox Jewish neighborhoods. I think the dark blue one is Boro/Borough Park. I would recommend reading about it on Wikipedia if you're curious.
I think the southernmost part of Brooklyn might be more like Staten Island--working class whites, probably mostly of Italian and Irish ancestry. But I'm not positive on that.
Basically, these are areas that aren't going to like a black guy named Hussein.
I think this map is worth reposting now:
Green=White
Blue=Black
Red=Hispanic
Yellow=Asian
White=No majority