In Washington, high gasoline prices are a political minefield of risk and reward for both parties. But the same can increasingly be said of natural gas, which now costs more than 10 times less in real terms. The Obama administration's go-ahead for the first liquefied natural gas (LNG) export terminal in the lower 48 states is driving a wedge among Democrats, and even within the GOP, where more domestic fossil-fuel production and free trade are articles of faith, the field of seven more companies hoping to build LNG export terminals presents a messaging test of sorts.