For a variety of reasons, it appears unlikely President Obama will be able to uphold his promise to close Guantanamo Bay before the end of his presidential term. Obama initially promised to close the prison by January 2010. Once that deadline passed, the plan was to move many of the detainees to a modified Illinois prison, which now appears unlikely.
Many politicians say that the Obama administration has done their part, but Congress has not done its part. Some say that the failed December bombing, and the failed Times square bombing, have changed many Americans attitude towards the prison. This may have caused weakening support in Congress to close the prison.
Closing Guantánamo Fades as a Priority | The New York Times