His Republican rivals include billionaire businessman John Catsimatidis and George McDonald, who heads a nonprofit group that helps the homeless.

WSJ: Lhota gets Conservative Party nod for NYC mayor

"It's like trying to determine the conclusion of a baseball game in the seventh inning, " says GM spokesman John McDonald.

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Republican candidates now include billionaire businessman John Catsimatidis, former Metropolitan Transportation Authority Chairman Joseph Lhota, and George McDonald, who heads a nonprofit for the homeless.

WSJ: Republican Tom Allon drops out of NYC mayor's race

"Overall I'm very optimistic and I think this is a good first step in the direction of allowing some research to move forward, " said Dr. John McDonald, director of the Spinal Cord Injury Unit at Washington University School of Medicine in St.

CNN: Reaction mixed to stem cell decision