Leaked Sanders memo attacks O'Malley on immigration.

'Martin O’Malley is mired at the bottom of the polls and struggling to raise money for his presidential bid, but Vermont Sen. Bernie Sanders' campaign is circulating an internal document to its staff and supporters tearing down the former Maryland governor’s immigration plan.

“While Governor O’Malley’s immigration platform is more detailed and progressive [than] Clinton, there are many immigration policy areas that it does not address,” reads the document, which goes on to outline how Sanders is more substantive on immigration policy than O’Malley on about a dozen issues including “enforcement, detention and humanitarian relief.”

A Sanders spokesman, Michael Briggs, denied the document constituted opposition research on a candidate still striving to gain any traction in the race. “We don’t see any reason to do opposition research on Gov. O’Malley,” he said, describing the memo as an “internal, matter-of-fact document sent to our staff and supporters comparing plans so people can have a better understanding of Bernie's proposals.”
The compare-and-contrast makes no mention of any of Hillary Clinton’s immigration reform proposals.'

http://www.politico.com/story/2015/11/bernie-sanders-memo-omalley-immigration-216218