And if he does not, it will be a taint that will be hard to erase.

FORBES: Is Hank Greenberg's Legal Nightmare Almost Over?

For the children of New Orleans the horrors of Hurricane Katrina are hard to erase, even two years later.

FORBES: Katrina's Surprise

But the killing of Amadou Ahmed Diallo will be extremely hard to erase.

ECONOMIST: ��Justice must be done��

These will be hard to erase even if new primary rules, which came into effect in time for votes on June 5th, succeed in making races more competitive (the jury is still out on this).

ECONOMIST: California��s Republicans

But for those who have lived through the Enron era, it will be hard to erase images of L. Dennis Kozlowki 's lavish party in Sardinia, complete with an ice replica of Michelangelo's David dispensing liquor from his .

FORBES: The Enron Era: Perps In Pinstripes

Eventually, the technicians had to use a software tool called BCWipe to completely erase the GCS' internal hard drives.

CNN: Computer virus hits U.S. drone fleet