Does it mean 57 percent Hispanics back Obama (the Illinois senator ) and 33 percent Hispanics back McCain?
Also, "4 percent" refers to "4% blacks suppor McCain?"
Context:
Seven in 10 blacks expect Barack Obama, the first African American to be nominated for president by a major party, to defeat Senator John
McCain in the Nov 4 election, the poll found.
Among registered voters, blacks support Democratic presidential nominee Obama by 92 percent to 4 percent.
Hispanics back the Illinois senator by 57 percent to 33 percent.
More:
http://www.chinadaily.com.cn/language_tips/news/2008-09/24/content_7056073.htm