U.S. President Barack Obama urged Congress to find common ground Saturday as lawmakers eyed a week of budget negotiations. 'For the sake of our people and our economy, we cannot allow gridlock to prevail,' Obama said in his weekly radio address. The president reprised his calls for freezing some spending while increasing funding for low-carbon energy and transportation and Internet infrastructure. Obama also outlined the strategy in his budget proposal for the 2012 fiscal year, which begins in October. But Congress is still debating the budget for the current fiscal year.Lawmakers passed a short-term budget plan that expires March 4 and are considering another short-term fix. If they fail to reach an agreement by the deadline, federal agencies will close.