Boone Pickens’ plan to massively expand wind production to free up more natural gas for vehicles is an audacious suggestion but it faces a key challenge rooted in natural gas’ virtue as a clean and versatile fuel for utilities to generate electricity.

Use the right energy for the right use. That concept lies at the core of a U.S. domestic energy plan unveiled Tuesday by legendary oilman T. Boone Pickens.

Like two rival filling-station owners across the highway in long-bygone price wars, Democratic Sen. Barack Obama and Republican Sen. John McCain keep putting up flashy signs and offering new incentives in hopes of attracting customers battered by $4 gas prices.