Jack and Suzy Welch suggest in the latest issue of Fortune magazine that Mitt Romney’s vice presidential selection will tell voters a lot about his leadership ability.

Every leader needs a team, and every leader benefits enormously from having a wingman, a partner who can be counted on to counsel, goad, provoke, listen, and on and on. It’s true in business, and it’s true in politics. A great person in the No. 2 spot can make the person at No. 1 decidedly stronger, smarter and more effective.

So, Mitt Romney, don’t blow the VP thing.

Fortunately, that would be pretty hard at this point. The current short list of contenders easily passes muster in terms of intellectual heft and leadership experience: Florida Senator Marco Rubio, Senator Rob Portman of Ohio, Representative Paul Ryan of Wisconsin, Governor Chris Christie of New Jersey, and Governor Bob McDonnell of Virginia. There’s not an iffy option in the bunch.