When the exit polling data showing Sen. John Kerry performing strongly leaked out this afternoon, it sent Wall Street into a tailspin. But as actual vote totals came in after the polls closed, it appeared the exit polls were inaccurate. The exit polls made it more difficult for television newscasters to project winners because of the conflicting data. Exit polls are surveys of voters leaving the polling places and are designed to provide data about what voters are thinking, rather than to provide evidence of trends in vote counts. Political websites gave Kerry an early lead over President Bush in...