The suicide bombings in London raise questions of assimilation for the 3 million Muslims in the US. WASHINGTON - It's called the "Virginia Jihad" case: Iraqi-American medical researcher Ali al-Yimimi, who preached in northern Virginia mosques and disseminated his radical thinking on the Web, was sentenced to life imprisonment last week. His crime: inciting followers, many of them young American-born Muslims, to a violent defense of Islam and war against the United States and its intervention in Islamic countries. Mr. Timimi's sentencing in an Alexandria, Va., courtroom came against the backdrop of the London bombings, which British police now say...