Asked about whether their increased engagement with Sanders is a sign they're concerned about Sanders, Clinton campaign spokesman Brian Fallon said: \"Republicans are trying to rip away the progress we have made on issue after issue, and we are making clear that Hillary Clinton is the best candidate to take them on and get things done.\"

But the Sanders campaign has taken it as a sign of worries.

\"See the new Fox poll that had Bernie up a lot in New Hampshire? No wonder they're in attack mode,\" Sanders communications director Michael Briggs said in a statement. \"Secretary Clinton and her team are getting nervous and nasty because the so-called inevitable nominee anointed by the establishment eight months ago doesn't look so inevitable anymore.\"

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