Impeachment really has little to do with Hillary. If anything, it paints her as a sympathetic victim (if that's possible). If she's overly sensitive about that, maybe it's because part of the liberal fantasy about a Hillary presidency is the thought of Bubba back as "co-president" again. As the unelected spouse the next time, Bill can whore around as much as he wants and nobody can impeach him over it.
I don't think it will be much of an issue with Hillary's campaign. She shouldn't waste too much political capital trying to keep it quiet.
No, this is exactly why MRS BILL CLINTON wants to permanently erase memories of the impeachment: she knows she has to have Bubba help her win the White House and then govern, but so long as he's wandering the halls, there are the ghosts of thongs and interns to contend with.