Republican presidential front-runner Mitt Romney said Tuesday he was surprised by Rick Santorum 's departure from the nomination race and that he has yet to turn to matters such as gathering names of possible running mates. "I do not even have a list," a buoyant Romney told Delaware voters a few hours after Santorum suspended his campaign and cleared the path for Romney's nomination. Romney told about 300 people in a steel fabrication plant that Santorum's announcement was unexpected. When a woman asked about his picking a running mate, Romney laughed and said, "I can't tell you when, and I can't tell you who." Romney said Santorum will continue to play an important role in the Republican Party and the nation's politics. He said he spoke to Santorum earlier in the day and that they discussed ways to move the nation forward. "This has been a good day for me," he said. Santorum's announcement in Gettysburg, Pa., d...