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Good news from Pakistan is rare. So it was a particular relief to hear of the capture in Karachi of the Taliban’s top military commander, Mullah Abdul Ghani Baradar. The joint raid by American and Pakistani intelligence forces is a sign that President Obama’s investment in better relations with Pakistan is bearing fruit. It is also a reminder of how much more could be done if the Pakistanis fully committed to the fight against the extremists.

Like most Americans, we are also closely watching the news from Afghanistan, as United States, NATO and Afghan troops battle to gain control of Marja, a Taliban stronghold in Helmand Province. The campaign is the first real test of Mr. Obama’s top commander in Afghanistan, Gen. Stanley McChrystal, and his ambitious...