Finding ambiguity as a prelude* to critical thinking is fun and relatively easy as long as we examine only those materials containing arguments we dislike.
But to challenge ourselves and our students, select a political speech that you admire as an exercise in identifying ambiguity.  In my case, for example, I might choose Franklin Roosevelt’s call [...]

 
October 5, 2009 was the first day for Justice Sototmayor in the U. S. Supreme Court. Two cases were argued that day before the Court. Justice Sotomayor was very assertive during the arguments.
Several commentators observed that Justice Stomayor asked more questions of the advocates on her first day than Justice Thomas has asked during his [...]

On the importance of the question.