She is not vying for his voters, why should she attack him and alienate them for no good reason? Bachmann's potential pool of voters are the anti-Romney movement conservatives and Tea Party folks.
If the time comes where Bachmann is fighting for the same voters as Romney, she will attack him without reservation. As of now, there just isn't much point.
Talking tort reform now.
Tricky balance of federal vs state.
Yea, you (the candidates)should agree and only fight where there is a difference.
The Tea Party menu is getting thin, but it is the correct vector for Conservatives.
There’s plenty of time to compromise, cave or capitulate later.
Or not!