Early exit polls show Mitt Romney’s win in the Illinois Republican primary rests on broad leads among voters with higher incomes and more formal education, with a boost from those focused on defeating President Barack Obama in November. KEYS TO THE MIDWEST: As in Ohio and Michigan, where Romney eked out narrow victories over Santorum, the two candidates ran about evenly among those with lower incomes and less formal education. But Romney outperformed his showing in the other two Midwestern... Read more