Also I would like to add a few more and these are all rough estimates.
Norwegian-Americans 50-49 for Obama
Swedish-Americans 51-48 for Romney
Danish-Americans 60-39 for Romney
Finnish-Americans 51-48 for Obama
Dutch-Americans - 62-37 for Romney
Belgian-Americans 50-49 for Romney
Welsh-Americans - 55-44 for Romney
French-Americans 52-47 for Obama*
Swiss-Americans - 52-47 for Romney
Czech-Americans 53-46 for Romney
Slovak-Americans 51-48 for Obama
Slovenian-Americans - 53-46 for Obama
Hungarian-Americans 51-48 for Obama
Portuguese-Americans - 60-40 for Obama
Arab-Americans 64-35 for Obama
Armenian-Americans 55-45 for Obama
Iranian-Americans 74-25 for Obama
Japanese-Americans - 64-35 for Obama
Hawaiian-Americans 69-30 for Obama
Sub-Saharan African - 84-15 for Obama
Afro-Caribbean 88-11 for Obama
Puerto Ricans - 87-12 for Obama
Dominican-Americans - 83-16 for Obama
Central Americans - 67-30 for Obama
South Americans - 74-25 (Colombian-Americans were probably over 40% for Romney)
*Cajuns went over 80% for Romney, while French-Canadians mostly in New England states probably were in the upper 50s for Obama.
I'm surprised that the Iranian/Arab vote is under 80% for Obama.