I think KH will get a "Honeymoon" period and some polls will edge a couple points in her direction, initially, and then the polls will settle back to about where they were.
The KEY polls obviously are in the BG states which will probably be decided by less than 3% on election "night" and the following day. My very rough summary of the electorate is 40% will always vote R and 40% will always vote D, nationally, but that doesn't matter when you consider a lot of the national polls are from NY and CA which favors Democrats in polling, but not in BG states.
KH was not an effective candidate on her own last time, we'll see if she can appear "better" this time. This is more about appearances than issues. She's still saddled with the feeling out there that something is wrong. And the economy COULD dip between now on November.