Cameron must beware the formidable dragon
In Arizona, a popular Democrat congresswoman is shot for being too liberal on health care; in Pakistan, the charismatic governor of the Punjab is assassinated for being too liberal on religious tolerance.
As MPs return to work at Westminster today, the global media headlines are a reminder that they are fortunate to be putting only their political careers rather than their lives at risk when they stand up in public and say what they think.
Even without the tragedies in the US and Pakistan, the mood at Westminster is sombre. The official terrorist threat level across Britain has been raised from "substantial" to "severe" -- one short of the highest possible -- and MPs are acutely aware of their own vulnerability.