WASHINGTON, Nov. 21 - Democratic leaders and senators from both parties expressed outrage on Sunday about an obscure provision in the huge end-of-session spending bill that would allow the chairmen of the Appropriations Committees and their staff assistants to examine Americans' income tax returns. Republican leaders said that their motives had been misread and that there was never any intention to invade the privacy of taxpayers. They promised that the provision would be deleted from the bill in a special session on Wednesday before the spending measure, which cleared Congress on Saturday night, was sent to President Bush for his...