I don't see any upside to this - except political. Is President Obama still chasing those mythical independent votes by acting like a hard-liner on immigration? Does he really not get how badly this undermines his support in the Latino community?

I'll give kudos to the Huffington Post for doing this kind of story, one that's far too often ignored:

WASHINGTON -- On a single day this past fall, the United States government held 13,185 people in immigration detention who had not been convicted of a crime, some of whom will not be charged with one, according to information The Huffington Post obtained through a Freedom of Information Act request. Instead, at a cost of roughly 2 million taxpayer dollars per day, the men and women were detained while immigration authorities sorted out their fates.

This case stands in stark contrast to the stated goal of immigration policy under the administration of President Barack Obama: to detain and deport unauthorized immigrants who've been convicted of crimes.

"ICE is focused on smart, effective immigration enforcement that prioritizes the removal of convicted criminal aliens, fugitives, recent illegal border crossers and egregious immigration law violators, such as those who have been previously removed from the United States," Immigration and Customs Enforcement spokeswoman Nicole Navas said in a statement. "ICE's enforcement approach is enhancing public safety in communities around the country."

[...] The FOIA request for information on all immigrants in detention on Oct. 3, 2011, turned up a list of nearly 32,300. Forty percent of those held by ICE had not been convicted of a crime, nor were they awaiting criminal trial. Despite what the term "illegal immigration" implies, simply being in the country without status is a civil, not a criminal, offense.

Rapists and murderers, frequently cited as the main unauthorized immigrants ICE is trying to remove, made up a far smaller percentage of those held that day than the innocent, traffic violators or low-level drug offenders, according to ICE's crime breakdown.

"The fact is, we're not deporting huge numbers of rapists and murderers," said Emily Tucker, director of policy and advocacy for the Detention Watch Network, which pushes for limiting detention and deportation. "They would like us to think that, but that isn't what is going on."