@roger,
I haven't seen her comments in context, but I'm sure Kagan was referring to the court's obligation to defer to the legislature's role in drafting laws as the expression of the public's will. In other words, even if the court thinks it could have done a better job of drafting legislation to accomplish a certain result, it must nevertheless defer to the legislature's decisions.
And for those interested in following along with some informed commentary,
Scotusblog is live-blogging the confirmation hearings.