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Claire McCaskill of Missouri, a Democrat running for the Senate, has made stem cells a campaign issue.
Senator Jim Talent, a Republican running for re-election in Missouri, has wrestled with the topic.
The question of whether the government should support or limit stem cell research has cropped up in Senate races in Maryland and Missouri, and in House races in California, Colorado, Illinois, New Jersey, Pennsylvania, Washington and Wisconsin, especially in suburban swing districts.
"What Democrats want to do is gin up their turnout in the suburbs and divide Republicans, and right now they may do that," said Jennifer E. Duffy, who tracks Senate races for the nonpartisan Cook Political Report. "This is the first real wedge issue Democrats have had with Republicans."
The topic may not...