Washington has made serious mistakes in Iraq, and they may lead to civil war.

However, he made a serious mistake on July 26, 2007.

He was said to have never made a serious mistake.

Let me explain why that would be a serious mistake.

The world watched her, she knew, waiting for a serious mistake.

Maybe he made a serious mistake, but can never seem to live it down.

"I really believe that California is making a serious mistake."

"These people traveling to Iraq are making a serious mistake."

Any other point of view started to be considered as a serious political mistake.

This is a serious mistake which we will have to pay for.