The United States still needs an ambitious agenda to make American products competitive overseas, Vice President Joseph Biden said Friday.Biden told an annual conference of the Export-Import Bank that U.S. workers can still compete with anyone in the world when trade rules are fair. He cited intellectual-property theft as an impediment and said it must stop.To stay competitive, Biden said the United States must reform its immigration system, maintain its presence as a Pacific power, and invest in economic infrastructure.The US economy is about halfway to the Obama administration\'s goal of doubling U.S. exports by 2015.