The case of Chinese human rights advocate Chen Guangcheng, who recently escaped house arrest, presents a “pivotal test for freedom in China and for U.S. credibility as a defender of freedom,” Bob Fu of the China Aid Association said. President Obama and Secretary of State Hillary Clinton have been careful not to speak in clear support of Chen, who climbed over the back wall of his home April 22 and reportedly sought refuge with the U.S. Embassy in Beijing.