So, in Kennedy's case, he was a Catholic. And people thought after the Al Smith election and so forth that a Catholic couldn't win in the United States. But when he was able to win in West Virginia, he proved that a Catholic could win, even in a heavily Protestant state.

I think Roosevelt proves himself to be the ultimate political force in this book. He really wasn't for primaries until he realized it was the only way in which he could challenge a sitting president then it becomes his crusade, is to create the primaries and to call for the people to rule.

When he [Franklin Roosevelt] ultimately does not get the Republican Party nomination and decides to start his new Bull Moose Party, he does, for the first time, let black delegates be part of the party from elsewhere in the country.

But he [Franklin Roosevelt] specifically prohibits any black participation from the Deep South, something which just infuriates people who'd been his supporters and who'd believed in him and resides that he is just shockingly abandoned the right of the people to rule. It's a pretty horrible story in that respect.

Reagan, people claimed, was too old to run for president and to be elected. But he proved himself such a vigorous campaigner in the primary system that he overcame those beliefs.

And of course, in the case of Barack Obama, had he not won primaries - and particularly the heavily important caucus in Iowa - if the public hadn't shown that they were prepared to vote for a black president, we wouldn't have one today.

You know, the primary process itself is very confusing. But in the end, I guess I believe what Winston Churchill said, which is that democracy is the worst form of government except for all the others. And that phrase of his, which I always have previously thought to be kind of acute, more recently I've thought of it in this way, to say well, you know what, he's also saying it's the worst form of government - except for all of the others.