Norton was considered very competitive in 2010, IIRC. I guess her time has passed.
Norton is a robot Romney type.
49% don't have an opinion of her and with those who do, she's at 20/32.
Actually, going back to March 2010, she was at a similar 25/35 spread but was tying Bennet. I think any perceptions of her strength have more to do with 2010 being a good Republican year as opposed to her merits as a candidate.
She was probably tying Bennet because it was a good Republican year, and because Bennet himself is a massive robot.