WASHINGTON - Sen. Barack Obama acknowledged Sunday he was considering a run for president in 2008, backing off previous statements that he would not do so. The Illinois Democrat said he could no longer stand by the statements he made after his 2004 election and earlier this year that he would serve a full six-year term in Congress. He said he would not make a decision until after the Nov. 7 elections. "That was how I was thinking at that time," said Obama, when asked on NBC's "Meet the Press" about his previous statements. "Given the response I've been getting...