Immigration officers detain people whom they suspect to be illegal immigrants during a search operation in Zapopan near Guadalajara July 29, 2014. (REUTERS/Alejandro Acosta)

President Obama's executive action on immigration isn't polling well -- except among Hispanics, of course. New data from Gallup bears that out. While Americans overall disapprove of the executive action 51 percent to 41 percent, Latinos support it more than two-to-one: 64 percent to 28 percent.

But drill down a little further, and you'll see that the topline number among Hispanics is somewhat misleading. Basically, Obama's move is hugely popular among only one particular Hispanic group: foreign-born Hispanics -- a.k.a. immigrants.

While Hispanic immigrants back the executive action 75 percent to 17 percent, Hispanics who were born in the United States are actually relatively evenly split: 51 percent to 42 percent in favor.

That's still in positive territory, but it's hardly a resounding stamp of approval for the executive action from non-immigrant Hispanics.

And that matters, electorally speaking. That's because Hispanics who are born in this country are much more likely to be Hispanic voters. In fact, while foreign-born Hispanics are about half of all Hispanic adults, according to Pew, they are only about 24 percent of Hispanic eligible voters. They were about 27 percent of Hispanic voters in 2012.

President Obama held a town hall meeting on immigration reform in Nashville on Tuesday where he called on Congress to pass a law to fix the nations a broken immigration system. (Reuters)

In other words, if you look just at Hispanics who are most likely to vote in the 2016 presidential election, Gallup's numbers suggest they aren't as supportive of the executive action as the main poll numbers suggest.

It's certainly something to keep an eye on as we try and assess the impact of the executive action on the Hispanic vote going forward. Hispanics do indeed support the executive action, and in large numbers, but not all Hispanics are the same, and many of this action's strongest supporters cannot vote in 2016.