WASHINGTON – Former presidential hopeful Rick Santorum urged his supporters to back fellow Republican Mitt Romney's campaign Monday in a late-night email that ignored that Santorum once calling Romney the "worst Republican in the country" during their bitter contest. He added: "Above all else, we both agree that President Obama must be defeated. The task will not be easy. It will require all hands on deck if our nominee is to be victorious. Gov. Romney will be that nominee and he has my endorsement and support to win this the most critical election of our lifetime."