Not quite sure what you're saying, but if you're claiming that Obama ran without a specific platform, you're wrong. For example, below is an excerpt from his platform on civil liberties. These weren't vague promises (although he made a lot of those, too). They were specific promises, and he's now broken most of them.
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Reclaiming Our Constitution and Our Liberties
As we combat terrorism, we must not sacrifice the American values we are fighting to protect. In recent years, we've seen an Administration put forward a false choice between the liberties we cherish and the security we demand. The Democratic Party rejects this dichotomy. We will restore our constitutional traditions, and recover our nation's founding commitment to liberty under law.
We support constitutional protections and judicial oversight on any surveillance program involving Americans. We will review the current Administration's warrantless wiretapping program. We reject illegal wiretapping of American citizens, wherever they live.
We reject the use of national security letters to spy on citizens who are not suspected of a crime. We reject the tracking of citizens who do nothing more than protest a misguided war. We reject torture. We reject sweeping claims of "inherent" presidential power. We will revisit the Patriot Act and overturn unconstitutional executive decisions issued during the past eight years. We will not use signing statements to nullify or undermine duly enacted law. And we will ensure that law-abiding Americans of any origin, including Arab-Americans and Muslim-Americans, do not become the scapegoats of national security fears.
We believe that our Constitution, our courts, our institutions, and our traditions work.
In its operations overseas, while claiming to spread freedom throughout the world, the current Administration has tragically helped give rise to a new generation of potential adversaries who threaten to make America less secure. We will provide our intelligence and law enforcement agencies with the tools to hunt down and take out terrorists without undermining our Constitution, our freedom, and our privacy.
To build a freer and safer world, we will lead in ways that reflect the decency and aspirations of the American people. We will not ship away prisoners in the dead of night to be tortured in far-off countries, or detain without trial or charge prisoners who can and should be brought to justice for their crimes, or maintain a network of secret prisons to jail people beyond the reach of the law. We will respect the time-honored principle of habeas corpus, the seven century-old right of individuals to challenge the terms of their own detention that was recently reaffirmed by our Supreme Court. We will close the detention camp in Guantanamo Bay, the location of so many of the worst constitutional abuses in recent years. With these necessary changes, the attention of the world will be directed where it belongs: on what terrorists have done to us, not on how we treat suspects.
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Our Constitution is not a nuisance. It is the foundation of our democracy. It makes freedom and self-governance possible, and helps to protect our security. The Democratic Party will restore our Constitution to its proper place in our government and return our Nation to our best traditions–including our commitment to government by law.