Not at all.
According to WH Press Secretary Robert Gibbs, President Obama was staging the scene from Star Wars between Darth Vader and Emperor Palpatine for the benefit of British PM Gordon Brown, who is apparently too inept to operate a DVD player.
< /sarcasm >
Update: April 8, 2009
From the “Life Imitates Art Dept.”, the White House is denying that Obama bowed to King Abdullah at the G-20 meeting in London.
“It wasn’t a bow. He grasped his hand with two hands, and he’s taller than King Abdullah,” said an Obama aide, who spoke on the condition of anonymity.
I am fairly sure that King Abdullah is taller than HRH Queen Elizabeth II. Still, “it wasn’t a bow.” No, it was what Janet Napolitano might call an “obsequious exhibition of submissive lumbar posture.”
And the anonymous aide’s explanation is undoubtedly what Penn & Teller would call an “adult male bovine fecal production.”