From Rolling Stone:
A big reason for the get-tough stance, say White House insiders, is that federal agencies like the Drug Enforcement Administration are staffed with hard-liners who have built their careers on going after pot. Michele Leonhart, a holdover from the Bush administration whom Obama has appointed to head the DEA, continues to maintain that pot is as dangerous as heroin – a position unsupported by either science or experience. When pressed on the point at a congressional hearing, Leonhart refused to concede any distinction between the two substances, lamely insisting that "all illegal drugs are bad."
"There are not many friends to legalization in this administration," says Kevin Sabet, director of the Drug Policy Institute at the University of Florida who served the White House as a top adviser on marijuana policy. In fact, the politician who coined the term "drug czar" – Joe Biden – continues to guide the administration's hard-line drug policy. "The vice president has a special interest in this issue," Sabet says. "As long as he is vice president, we're very far off from legalization being a reality."
"The citizens have become more savvy about the drug war," says Franklin, the former narcotics cop. "They know this is not just a failed policy – they understand it's also a very destructive policy." With an eye on his legacy, Franklin says, Obama should treat pot prohibition like the costly misadventures in Iraq and Afghanistan: "This is another war for the president to end."