By Jack and Suzy Welch
FORTUNE -- Several months ago, we met a CEO who had one main complaint about his job. It wasn't foreign competition or fickle consumers. No, it was loneliness. "I make every decision by myself," he moaned.
"That's nuts!" was our immediate reply. "You can't run the place that way!"
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.
So how should Romney choose among them? To answer that question, we've put together a scorecard that rates each candidate against six criteria we consider essential in a vice-president.
Of course, it's possible none of these individuals will be Governor Romney's final pick. Both Dan Quayle and Sarah Palin took most everyone by surprise, to put it mildly. But even if Romney were to select a wild card like Condoleezza Rice – who has loudly disavowed any vice-presidential aspirations – the selection criteria should remain the same:
First, a VP must be able to be president, not eventually, but from Day One. The main, unfortunate reason for this doesn't need to be said. But such a requirement is also about creating confidence in government. The right VP pick sends a message to America and the world: No matter what happens, the bottom will never fall out of our system.
Again, all of the current VP contenders could serve in the Oval Office without hesitation, but Portman's nearly 20 years of government service and Christie's and McDonnell's tenures as chief executives of their states give them an edge on this count.
Second, a VP can't be a clone of the president. There's just no point. A VP's value comes from bringing different skills and abilities to the table – as meaningful as they are complementary. Rubio, for example, would contribute inspiring oratory to Romney's repertoire; Ryan an intricate understanding of the more-important-than-ever budget options; and Portman a thorough understanding of Washington's inner workings. Christie would add a level of excitement and humanity to the White House. Bottom line: With the exception of McDonnell, who's very similar to Romney, the candidates are all about equal on this criterion.
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