http://online.wsj.com/article/SB121149958822915813.html?mod=djemEditorialPage The Obama Learning Curve Senate Foreign Relations Committee Chairman Joe Biden took to the airwaves this week to "help" the rookie Barack Obama out of a foreign-policy jam. Oh sure, admitted Mr. Biden, the presumptive Democratic nominee had given the "wrong" answer when he said he'd meet unconditionally with leaders of rogue states. But on the upside, the guy "has learned a hell of a lot." Somewhere Mr. Obama was muttering an expletive. But give Mr. Biden marks for honesty. As Mr. Obama finishes a week of brutal questioning over his foreign-policy judgments, it's become clear he has learned a lot – and is learning still. SNIP Mr. McCain has every intention of running his opponent through the complete foreign-policy gamut. Explain again in what circumstances you'd use nuclear weapons? What was that about invading Pakistan? How does a policy of engaging the world include Mr. Ahmadinejad, but not our ally Colombia and its trade pact? It explains too the strong desire among the McCain camp to get Mr. Obama on stage for debates soon. There's a feeling Mr. Obama is still climbing the foreign-policy learning curve. And they see mileage in his issuing a few more gut reactions.