The Bush's Hate for Kerry goes way back

Mary at the Left Coaster asks the question Why Is This Election So Personal? and then goes on to describe the long history of Kerry versus the Bush family.

As Jeanne said in her essay, sometimes a good way to judge people is by their enemies. John Kerry has gathered some daunting enemies as he sought to stop the Vietnam war and its needless deaths, as he put a crimp in the illegal Iran-Contra operation, as he broke-up the BCCI bank that was used to launder dirty money for drug cartels and terrorists (an offshoot of his investigations into Iran-Contra), and today by his relentless drive to deny Bush a second term. Kerry is offended by George W. Bush who has subverted the constitution and our international agreements to launch his war of choice because Bush has drug the country into another ugly war based on lies and the inability to admit a mistake.

So Kerry has a long history of trying to stop the Bush family and their allies. Read Mary's entire post, many more details.