He isn't left on everything, but he is left on a lot.
http://www.washingtonpost.com/wp-dyn/content/article/2007/05/08/AR2007050801212.html
There was at one point an outright ban on guns in DC. Anyone with any sense of objectivity can look at the constitution and see that is clearly an abridgment of the "right to own and bear arms". This was quickly struck down as unconstitutional.
In 2007 this particular justice was part of a minority opinion to re-consider DC's law on appeal, after it had been struck down. The majority opinion was that it wasn't worth re-considering. It eventually went to the SCOTUS where it was struck down.
So this guy apparently believes that banning guns is compatible in some way with "shall not be abridged".
While there might be some in-between positions there, anyone who can justify that stance is not someone I would want to see as on SCOTUS. Even if you think guns should be banned, that someone can ignore the clear verbiage on something like that implies they may do the same thing in "interpreting" any constitutional right or law.