President Obama made light Tuesday of the hot microphone moment he had the day earlier with Russian President Medvedev, where he said that after the November election, he'd have more "flexibility" on the issue of missile defense. Just as leaders were greeting one another and about to sit down at the opening session of the Nuclear Security Summit, Obama spotted Medvedev, looks over at him, puts his hands over the microphone in front of him with a big smile, and then goes to greet the Russian president. Obama was asked about the "flexibility" statement later while making remarks to the...