CNN just released a new presidential poll showing a tight 2 point margin for President Obama going into the Republican convention. I’d say the even bigger story is down in the details. This is the first poll that CNN has released with “likely voters” — just like Fox’s most recent poll did. If you look at the number for registered voters it’s a 9 point Obama margin.What that means is that President Obama has actually gained a bit of ground (obviously within the margin of error) on last week’s eye-popping poll showing him with a 7 point lead over Mitt Romney. But it also shows that turnout and propensity to vote are going to be the whole game going into November.

Likely voter screens almost always provide some GOP edge. But 7 points is an extremely large one for a presidential contest.

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