Favorites to win the Norris

Are there any clear frontrunners to win the Norris this year? In my opinion, the race seems pretty tight at the moment with Weber, Chara, and Girardi being names that are used in discussion.

Also, does anyone else see Erik Karlsson as a legitimate candidate this year? He's shown that he's the best offensive defenseman in the league this year while playing average defense against other team's top lines.