As I said days ago here, now that she's behind, Senator Clinton will begin to play even rougher:
"Hillary Clinton’s campaign intends to lure pledged delegates from Barack Obama if she feels she needs them to win the nomination come convention time in August, The Politico reported Tuesday. The strategy was confirmed to Politico by a “high-ranking Clinton official,” and represents the most recent tactic from the campaign to compensate for the New York senator’s shortfall in pledged delegates, which are awarded through the results of primaries and caucuses...But in going after Obama’s pledged delegates, Clinton would be asking them to go against their signed — but not mandatory — pledge to support the Illinois senator, Politico reported. “All the rules will be going out the window,” a senior Clinton official told Politico. Clinton’s campaign denied the report..."
Of course they deny it.
But I doubt anyone believes their denial, nor should they.