Continued from page 1

“There’s already very high-intensity opposition, so that’s in the GOP’s favor. There has not been to date high-intensity support, and that’s where there’s potential growth for the president,” Mr. Zogby said.

Still, he said the playing field has been so stable that he doubts the ruling will boost Mr. Obama or presumptive Republican presidential nominee Mitt Romney dramatically.

“I don’t see Obama floundering by huge amounts or going up to a big majority,” he said.