Romney's evolution on tax policy is also telling.

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Consequently, the Committee also indicated that future policy decisions will depend on the evolution of the outlook for both inflation and economic growth, as implied by incoming information.

NPR: Bernanke: U.S. Growth 'Moderate' as Inflation Rises

The policy changes are less a function of an internal evolution and more likely motivated by external factors.

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This evolution is about survival of the fittest - which policy mutation allows the most votes to survive.

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The former Nato Secretary General, Lord Robertson, told the BBC it was also an important moment in the evolution of the EU's defence and security policy, although he said the EU needed more heavy planes and troops if it were to fulfil its peacekeeping ambitions.

BBC: NEWS | Europe | EU force starts Bosnian mission

At this stage in the evolution of the workforce, the problem is surely not policy.

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But looking back at Giuliani statements and policy positions over the past 20 years, there is clearly an evolution in some of his positions, or in his emphasis, especially when it comes to abortion restrictions.

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But Giuliani aides reject the flip-flop label, and say any evolution in his thinking is the result of life experience and the very different policy calculations facing a president versus a mayor.

CNN: Will GOP voters accept Giuliani's evolution on abortion?