The internet and sites such as Youtube have made it much more difficult for politicians to leave their past statements behind. Anything they say or do in public may be recorded by an unsuspected cell phone or digital recorder and posted on the internet in a matter of seconds. As comedian Jon Stewart remarked, don't they know we're filming everything they say?
Here are two videos showing politicians making statements very different from what they're saying today.
In the first, key Democrats make claims with certainty that Saddam is pursuing or has weapons of mass destruction.
In the second is Dick Cheney in 1994, arguing why we shouldn't go into Baghdad: would create an occupation, would see pieces of Iraq fly off, would create a quagmire, would cause additional casualties that the removal of Saddam wasn't worth.
Of course, there are legitimate reasons for someone to change his mind on an issue. Videos such as these may hold politicians accountable, provoking them to explain why they changed their minds.