WASHINGTON--Sen. Tim Johnson, D-S.D., was reported in critical condition today after undergoing emergency surgery, placing Democratic control of the U.S. Senate in 2007--and resolution of some serious industry issues--into question.

At 9:30 a.m., the U.S. Capitol physician said Sen. Johnson underwent successful brain surgery for an arteriovenous malformation, a condition which causes arteries and veins to grow abnormally large.

His grave illness raises anew questions as to which party will have the upper hand. Congress is dealing with such critical industry issues as extension of the Terrorism Risk Insurance Act after 2007, the optional federal charter, and removing the ban on the government establishing rates for the prescription drug benefit program under Medicare.

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