Stocks tumbled ahead of the vote and the selling accelerated on fears that Congress would not be able come up with a fix for nearly frozen credit markets. The frozen markets mean banks are hoarding cash, making it difficult for businesses and individuals to get much-needed loans.
According to preliminary tallies, the Dow Jones industrial average lost 777.68, surpassing the 684.81 loss on Sept. 17, 2001 - the first trading day after the September 11 attacks. However the 7% decline does not rank among the top 10 percentage declines.
The Standard & Poor's 500 index was down 8.7% and the Nasdaq composite 9.1%.
"The stock market was definitely taken by surprise," said Drew Kanaly, chairman and CEO of Kanaly Trust Company, referring to the House vote. "If you watched the news stream over the weekend, it seemed like it was a done deal. But the money is being held hostage to the political process."