It was directed, pure and simple, at co-opting Mr. McCain's help against what Mr. Obama understands is now his biggest obstacle: Senate Minority Leader McConnell.

WSJ: Obama's Senate Play

But perhaps his biggest obstacle is at a place called Karni.

NPR: One Man's Struggle to Do Business in Gaza

Nadal is poised to be Federer's biggest obstacle in his bid to retain his French Open title later this month, having ended an injury-wrecked past 12 months by winning his first two events of this season on clay.

CNN: Federer registers first clay win of 2010