SPRINGFIELD — Mary Karmeier will cast her vote in next week’s primary for David K. Overstreet — one of two Republican candidates vying for the seat currently held by her husband, Illinois Supreme Court Justice Lloyd A. Karmeier.In a letter addressed to voters and published by the Overstreet campaign, Mary Karmeier on Wednesday said she “wholeheartedly supports” the 5th District appellate justice because he received the same “highly recommended” evaluation from the Illinois State …