I am on my way out the door, so don't have time to say much other than here is the link.

From Article:
General Motors said Wednesday it has fallen far short of the bondholder support it needed for its proposed debt-for-stock offer, virtually guaranteeing that the nation's largest automaker will be forced to file for bankruptcy court protection within the next five days.

The bondholders were not satisfied with the prospect of owning only 10% of the company when the U.S. government would own nearly 70% and a union-controlled trust fund up to 20%.