Responding to rising gasoline prices, President Bush and candidate John McCain are calling on Congress to end the moratorium on drilling for oil off-shore. For both the President and the Senator, this is a change in policy; Barack Obama calls it a "flip-flop." Oil companies concede that nobody knows how much is available, how long it would take to produce or what the impact on prices might be. But Democrats in Florida and Virginia are among those joining Republicans who want the moratorium lifted. Has rage over fuel costs reached a tipping point or is McCain making a risky political bet? What about the environment, global warming and the effort to get America off the oil economy?