Why are the Republicans so especially concerned about judicial nominations?
Judicial posts are both political nominations and permanent. What this means is that a party can offer a pretty cushy, tenured job to someone with complete indifference as to qualifications (or, more precisely, lack thereof). A federal judgeship is the ideal reward for a political crony who is loyal, yet too stupid or crude to even be a consultant. Obviously the satiation of such individuals is of the highest importance in modern politics.