This is the problem with Hillary Clinton. She is highly intelligent, has real experience and is an attractive candidate. But she is terrified to act on her beliefs. In fact, she seems so conditioned by what she sees as political constraints that one can barely tell where her beliefs begin and where those constraints end.

Partly, this is a generational difference. Bill and Hillary Clinton grew up in an era of Republican dominance. For much of the last 30 years, the Republican Party has been the party of ideas (a point made repeatedly by Daniel Patrick Moynihan), and Ronald Reagan was seen by much of the country to have rescued America from malaise and retreat. The Clintons' careers have been shaped by the belief that for a Democrat to succeed, he or she had to work within this conservative ideological framework. Otherwise one would be pilloried for being weak on national security, partial to taxes and big government and out of touch with Middle America's social values.

For 30 years this has been the right bet. It's why Bill Clinton was the only successful national Democratic politician in that period. But is it still the right wager? Obama has grown up in a different landscape—with vastly different geopolitics, economics and culture. Bill Clinton and George W. Bush have been the defining political figures of the recent past. Conservatism has lost its monopoly role. As a result, the new generation is not defensive about its beliefs, nor does it feel trapped into the old categories like hawks versus doves and markets versus taxes.

This is not naiveté. Obama's position on Cuba is not all hope. Most of the older generation of Cuban-Americans are hard-line Republicans anyway, so it's probably pointless courting them. And the younger ones—under 45 or so—are far less wedded to the punitive approach and symbolic battles of the past. So Obama is taking a calculated risk that the time is right.

Cuba policy is a microcosm for this difference in attitudes. Obama has spoken in favor of a proposal—made by Henry Kissinger, George Shultz, William Perry and Sam Nunn—that in order to get the world more serious about nuclear nonproliferation, the United States should begin to fulfill its end of the treaty and reduce its own nuclear arsenal. Again, for all I know, Hillary Clinton agrees with this approach. But she won't say so. Her long years of experience—in the 1970s, 1980s and 1990s—warn her against such audacity. But the world has changed so much—the cold war is a distant memory, capitalism has spread across the world, new threats come not from states but small bands of people, unilateralism is discredited—that perhaps it is time for America to change as well.

Correction: In his Feb. 11 column, "The Wrong Experience,"  Fareed Zakaria wrote that Hillary Clinton "won't say" whether she supports an initiative, proposed by Henry Kissinger, George Shultz,  William Perry and Sam Nunn, to reduce America's nuclear arsenal. In fact Senator Clinton has supported the initiative.

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