Looking back on 2011 & Daegu, and forward to 2012 & London, I find three areas in the U.S. that concern me. One is the men’s sprints & hurdles which I recentlytouched on. Another is our field events in general – something I’ll be talking about in the very near future. The other, that I’ll be addressing today, is our male middle distance runners. I say this in spite of Matt Centrowitz’ surprise bronze in Daegu, because it was just that – a surprise. Because right now there is only one middle distance runner that we can count on to produce when needed – Bernard Lagat – and his career…