When R.A. Butler, quoting Bismarck, described politics as the ‘art of the possible’, he was spelling out the pragmatist’s creed. Yet, if nothing else, Barack Obama’s rise to become the Democrats’ candidate for the White House shows that ‘the possible’ can still be extraordinary. Only four years ago, Obama was a mere state senator in Illinois, a rookie legislator with a keen intellect and a bright future.

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