They are lying, and we know it.
But let's not assume that. The Democrats are united by a love of raw power, socialism and an irrational hatred of George W. Bush. But they might be smart enough to damper the last one in order to enhance the first two.
Of course I could be wrong - no one thought Republicans would impeach Clinton, and folks like us all but forced them to (and I was right with them, yeehaw.) But I never thought impeachment of Bush was all that realistic anyway. Impeach him for what? Having bad intelligence? Arguably going too far in securing our nation (NSA wiretaps?) Does the Democrat Party really want to throw a President from office for trying too hard, who immediately admitted the existence of the NSA program?