Problem is, it's in Iran. Anne Korin and Gal Luft at the IAGS have an interesting article (PDF link here) on how the Iranian government is trying to get around the threat of international sanctions by replacing domestic gasoline demand with natural gas -- something Iran has in abundance.
Clearly, America doesn't have huge amounts of natural gas left under the ground. But that's really not the point. If America is serious about reducing it's vulnerability to foreign disruptions, rather than passing stupid bills that won't fix the problem, American policymakers should be working on using the resources that America actually has and could replace gasoline and diesel consumption. When Iran -- theocratic, closed-minded, hobbled by incompetence -- is pursuing better energy policies than the US Congress, there's something seriously wrong.