PICK & CHOSE WHICH LAWS TO ENFORCE

The New York Times had this in their recent edition regarding the California Prop 19 vote:

Attorney General Eric Holder says the federal government will enforce its marijuana laws in California even if voters next month make the state the first in the nation to legalize the drug. 

The Justice Department strongly opposes California's Proposition 19 and remains firmly committed to enforcing the federal Controlled Substances Act in all states, Holder wrote in a letter to former chiefs of the U.S. Drug Enforcement Administration. 
The Associated Press obtained a copy of the letter, dated Wednesday.

"We will vigorously enforce the CSA against those individuals and organizations that possess, manufacture or distribute marijuana for recreational use, even if such activities are permitted under state law," Holder wrote. 

So we are to understand that the Federal Government is prepared to enforce their Federal Laws in California if the state decides not to, at the same time the Federal Government blocks Arizona Law Enforcement when that state decides to enforce the Federal Laws for them?

Just checkin.