In a campaign defined by Republican reluctance to embrace Mitt Romney, Rick Santorum has emerged as the latest not-Romney candidate to surge ahead. While it's impossible to predict what will happen in this volatile election season, the data suggests that Santorum might be more of a challenge for Romney than earlier flavors of the month. The latest Rasmussen Reports poll of the GOP race shows that Rick Santorum leads Mitt Romney by 12 points, 39 percent to 27 percent. Newt Gingrich and Ron Paul are far behind. In and of itself, that's nothing new. The man from Massachusetts has at...