Mayoral candidate Toni Preckwinkle announced Sunday evening that she would return the $116,000 raised for her county board re-election run at Ald. Ed Burke’s home, and that she had ousted him as chairman of the Cook County Democratic Party Judicial Slating Committee. Two mayoral candidates hoped to capitalize on Chicago Bears’ playoff fever — while three others sought to highlight rivals’ ties to Burke, who is facing attempted extortion charges. Meanwhile, the challengers hoping to unseat Ald. Pat O’Connor (40) blasted his new job as Finance Committee chairman.