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Brown faces pro-abortion Democrat Martha Coakley in a race to replace the late pro-abortion Sen. Ted Kennedy.
The outcome of the election has a significant bearing on the health care-abortion debate because the Senate approved its bill on a narrow 60-40 margin. Should Brown win, he has already promised to support the filibuster against the measure.
Democrats and Obama have been finalizing a compromise version of the legislation that would still require 60 votes in the Senate and a Brown win would drop the margin to 59-41 -- enough to defeat the bill.
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