Of course Ari Berman is right on this.  But his column also contains something I had not heard:

The bill was written specifically with Cantor in mind, watered down on the key issue of voter ID to attract GOP support. I was told recently from a well-placed Capitol Hill source that Cantor planned to eventually announce his support for the bill, but was waiting for the right strategic moment. Now it’s unlikely he will be in Congress in 2014 and even more unlikely the legislation can get through the House without him.