KENOSHA, Wis. (AP) -- A word of advice to candidates campaigning in Wisconsin: Don't get between voters and their cheese. Vice President Joe Biden seemed to irritate a shopper at the Mars Cheese Castle in Kenosha on Friday .. As Biden cheerily greeted customers, a 30-something woman tried to explain what was happening to her young daughter. The woman said -- quote -- "This is a battleground state. They're trying to win it. I just need some limburger cheese."