BTW, all the people here whining that their pet choice of this three people or that did not get it really need to get real. On an earlier thread here people listed well over 100 people who might deserve the prize, so there is pretty clearly no great priority for your little pet set of those. Get real.
As it is, these three are certainly deserving and too bad Krueger not alive to get it. One can argue that Card a naughty naughty for his support of Harvard, but Card-Krueger has undoubtedly been one of the most influential papers in economics of the last several decades. After all, it upended something that was a total truism in almost every Principles textbook, with minimum wages being the poster boy example of the awfulness of trying to set a minimum price above a suppposedly equilibrium price. Quantity demanded will fall and there will be a surplus! Just look at the supply and demand diagrams!
It is not all that often that something so widely accepted it is in all the Principles textbooks is found not to be universally true.