This week’s lesson has just as much to do with marketing a service or product, or positioning your company, as it does with politics.

The Clinton campaign spent the better part of the week attacking Senator Obama, accusing him of "borrowing" some of his popular lines:

If you are going to charge that your opponent (or competitor) is unfit due to _______(fill in yourself), make absolutely certain that you are not, and have never been, guilty of ______(same as above) yourself.

During last night’s Democratic debate, this was Senator Clinton’s final statement:

This is an instantaneous credibility killer, and will turn out to be a net negative every time.

People who live in glass houses should not throw stones.