California's Democratic politicians often decry special tax loopholes and other corporate subsidies, but when it comes to one business sector - the movie industry - they make a huge exception. Not only is the Southern California-based movie industry heavily unionized, but its executives are almost all political liberals who donate lavishly to Democratic campaigns. That, in a nutshell, explains why the Democratic speaker of the Assembly, Fabian Núñez, quietly amended a bill this week to grant movie producers tens of millions of dollars in subsidies from a state treasury that already is drowning in red ink, with multibillion-dollar annual deficits....