>they both offer a public option that improves the coverage
>and reduces the cost.
>
>they both have private insurance during the transition.

It is mainly the points brought up in reply #225 plus not trusting Warren's lack of history on the issue, negotiating away too much in advance, muddying the meaning of M4A and knowing that if private insurance isn't fought back with the 1st and only bill that the insurers will work six ways from Sunday to undermine it and its momentum.