Like the famous racehorse Silky Sullivan, Sen. Rick Santorum is known as a great closer. Yet, months ago, he had been virtually given up for dead by pundits in his race against Bob Casey, Jr., son of the popular, pro-life, former Democratic governor of Pennsylvania. One poll early this year had Santorum down 23 points, an almost insurmountable deficit. A Strategic Value poll had Santorum down 16 points. Now the senator who had been written off is finishing fast. An average of all polls monitored by the RealClearPolitics.com website finds him trailing by 6 points. The most recent Strategic Value...