Senate Democratic leaders say last-minute changes to the health care bill include giving nonprofit health insurance companies an exemption from the excise tax on insurers, a revision pushed by Sen. Carl Levin, who is a major recipient of campaign contributions form mega nonprofit Blue Cross Blue Shield. The excise tax or fee on health insurance companies was expected to bring in $6.7 billion to help pay for the nearly $1 trillion bill, but the complete exemption for nonprofits sought by Mr. Levin, Michigan Democrat, would cut the revenue in half. "The health insurance fee proposal in the pending Senate bill...