The latest Quinnipiac poll shows that — by a 15-point margin — the Supreme Court's Obamacare ruling makes voters less likely, rather than more likely, to cast their vote for President Obama. Twenty-seven percent of registered voters say that the ruling makes them "less likely" to vote for Obama, while only 12 percent say that it makes them "more likely" to do so. Only 9 percent of independents say that they are "more likely" to vote for Obama because of the ruling, compared to 27 percent who are "less likely." 

Among Catholics — a large percentage of whom are historically swing voters — 35 percent say that the ruling makes them "less likely" to vote for Obama, while only 10 percent say it makes them "more likely" to vote for him.

Most voters (55 percent) say that the candidates' positions on Obamacare will be "extremely" or "very" important in influencing their vote for president.