Republican presidential contender Rick Santorum has overtaken Mitt Romney in the battle for the party’s nomination. According to the Pew Research Center poll, it also shows both losing to President Barack Obama in hypothetical matchups.Santorum got 30 percent of Republican voters in the February poll, while Romney got 28 percent. And according to a survey of all registered voters – Obama holds a 10 percentage point lead over Santorum and 8 points over Romney.Romney’s status in the race was shaken when Santorum won Colorado, Minnesota and Missouri on February.