Will we be attacked by Terrorists?

This article from the Times online suggests strongly that Londoner's should expect a "Mumbai style" attack at any time going forward.

The attacks in 2008 in Mumbai involved a group of dedicated professional terrorists which killed approximatley 173 people and injured many more and went on for days.

A key question for Americans, is could the same thing happen here? Or, when might the same thing happen here? We have now targeted Afganistan as the place we are fighting terrorism. We have embarked on a confusing strategy in Afganistan with no clear objective. We have indicated we are not really committed to victory thers (of any sorts). So how best might the Taliban and radical islamists convince us to leave earlier rather than later?

Maybe by showing us terrible consequences for staying there at all. What if there is a terrible attack in a place like, say Houston? Hundreds or thousands killed, and direct linkage to Afganistan or Pakistan with clear indications of more to come? How will this President respond? How will our military generals want to respond? This may be a time of testing America's resolve to defend herself and her people. How will we do on that test?