The Wisconsin GOP Primary 2012

SOCIO-ECONOMIC OPPOSITES: Voters in Tuesday's Maryland and Wisconsin primaries are socio-economic foils.

In Maryland, nearly half of voters have family incomes of $100,000 or more annually. That's the highest level of any state where an exit or entrance poll has been conducted this cycle. In Wisconsin, just 26 percent have incomes at that level. And 57 percent of Maryland's Republican voters are college graduates, while the same share in Wisconsin lack a college degree.AP