Full crosstabs:
http://www.suffolk.edu/documents/SUPRC/12_8_2015_partial_tables.pdfTrump wins all demographic groups except for Independents (with whom Rubio narrowly edges Trump) and Hispanics (Rubio ties with Trump).
By region:
Midwest:
Trump 19%
Cruz 18%
Carson 16%
Rubio 16%
Northeast:
Trump 46%
Rubio 19%
Cruz 5%
South:
Trump 26%
Cruz 21%
Rubio 12%
Carson 11%
West:
Trump 24%
Rubio 20%
Cruz 15%
Carson 10%
The GOP sample includes 15 blacks:
Trump 33%
Carson 13%
Cruz 13%
Bush 7%
Kasich 7%
Rubio 7%
and 20 Hispanics:
Rubio 25%
Trump 25%
Cruz 15%
Carson 5%
Christie 5%
Huckabee 5%
Kasich 5%
Paul 5%