1. Opposing attempts to get innocent people out of jail means letting the guilty run free. Eschaton and LGM covered this recently (the Texas Monthly story is incredible).
2. The Bush Administration decreased enforcement of environmental and white collar crimes, and you can expect similar results at state levels.
3. Republican elites hide behind pretenses of defending individuals from overzealous prosecution while serving the worst corporate excesses. Read this Redstate article on Criminalizing America - not once is protecting lawbreaking corporations mentioned. I stopped and read while skimming Redstate because of the name of the author, alecstates. Anything from ALEC deserves special attention and admiration. Read the actual model legislation and its slightly clearer that requiring intentional breaking of the law, and not just intention to commit the act, is meant to make it incredibly difficult to prosecute a corporate entity. That particular proposal apparently traces back to the Texas Public Policy Foundation, part of the Kochtopus.
I'm sure there's more.
(And it goes without saying that Obama should have pushed much harder on financial crimes related to the Great Recession, although it looks like some things are finally happening.)