Some early exit poll information from Wisconsin, via CBS News and the Atlantic:
27 percent of Dem voters made up their mind in the last week, the rest earlier. Voters who think change is the most important characteristic outnumber those who value experience, 52-24. Twenty-seven percent of the voters are independents. Clinton is viewed as the one mostly involved in unfair attacks, Obama is viewed by 60 percent as the one who can unify the country, and the two are virtually even in commander-in-chief abilities.
