March 19, 2012 The Improbable Mr. Santorum Outgunned in staff and money, disdained by the media, he refuses to be silenced and remains Romney's only real rival. By WILLIAM MCGURN When the Illinois primary closes in the next 24 hours, it is improbable that Rick Santorum will emerge victorious. Given the states that are left, arithmetic suggests it is equally improbable that Mr. Santorum can overcome Mr. Romney's lead in delegates. Perhaps most improbable of all is the hope that a contested Republican convention would settle on Mr. Santorum as its nominee. Then again, that Mr. Santorum would be where...