Watch This: 'One President at a Time'

In response to an op-ed criticizing his economic prescription for Europe written by a senior economic adviser to Mitt Romney's campaign, President Obama chastised the Romney camp, telling reporters at the G-20 conference in Los Cabos, Mexico, yesterday: "I would point out that we have one president at a time and one administration at a time."

Just in case you forgot who was in charge.

"I think sometimes back home there's a desire to superimpose whatever ideological arguments are taking place at home onto a very complicated situation in Europe," he added.

Read more at the Washington Post.