Barack Obama came out swinging today in the aftermath of President Bush's address yesterday to the Israeli Knesset. Bush said those who would talk with terrorists were engaged in "appeasement" like that of the Nazis during World War II. In South Dakota, Obama called that an "appalling attack" on him, and he said John McCain picked up on it with Internet bloggers. Obama told a South Dakota town meeting he just had to get that off his chest. Mark Halperin is senior political analyst and editor at large with Time magazine.