Here is PROOF she played the assassination card:

RFK, Jr. On Hillary's Remarks
By Big Tent Democrat, Section Off Topic
Posted on Fri May 23, 2008 at 08:39:14 PM EST

“I’ve heard her make that argument before,” Mr. Kennedy said, speaking on his cell phone as he drove to the family compound in Hyannis for the holiday weekend. “It sounds like she was invoking a familiar historical circumstance in support of her argument for continuing her campaign.” . . . is support of Mrs. Clinton has not wavered.
More from RFK, Jr.:

I have heard her make this reference before, also citing her husband's 1992 race, both of which were hard fought through June. I understand how highly charged the atmosphere is, but I think it is a mistake for people to take offense."

Your candidate referred to directed violence. Obama is ahead, he IS (going to be) the democratic nominee, and your candidate is suggesting she stay in the race because, "you know, anything can happen."

I certainly hope your candidate isn't wishing it on him, but I would not put it past her.Text

"Earlier today I was discussing the Democratic primary history and in the course of that discussion mentioned the campaigns that both my husband and Senator Kennedy waged in California in June 1992 and 1968 and I was referencing those to make the point that we have had nomination primary contests that go into June.
That’s a historic fact. The Kennedys have been much on my mind the last days because of Senator Kennedy and I regret that if my referencing that moment of trauma for our entire nation, and particularly for the Kennedy family was in any way offensive. I certainly had no intention of that, whatsoever. My view is that we have to look to the past and to our leaders who have inspired us and give us a lot to live up to, and I’m honored to hold Senator Kennedy’s seat in the United States Senate from the state of New York and have the highest regard for the entire Kennedy family."

Transcript from the Argus-Leader's editorial board meeting:

HRC: People have been trying to push me out of this ever since Iowa.

Q: Why?
HRC: I don't know. I don't know. I find it curious. Because it is unprecedented in history. I don’t understand it. Between my opponent and his camp and some in the media there has been this urgency to end this. And historically, that makes no sense. So I find it a bit of a mystery.

Q: So you don't buy the party unity argument?

HRC: I don’t because again I've been around long enough.
My husband did not wrap up the nomination in 1992 until he won the California primary somewhere in the middle of June, right?

We all remember Bobby Kennedy was assassinated in June in California. I don’t understand it. There's lots of speculation about why it is.

Q: What is your speculation?

HRC: I don't know. I find it curious. And I don't want to attribute motives or strategies to people because I don't really know, but it's a historical curiosity to me.

Statement from the Argus Leader

The Argus Leader’s Executive Editor Randell Beck issued the following statement today:

"The context of the question and answer with Sen. Clinton was whether her continued candidacy jeopardized party unity this close to the Democratic convention. Her reference to Mr. Kennedy's assassination appeared to focus on the timeline of his primary candidacy and not the assassination itself."