The reason that Kerry uttered that Bush operatives are "crooked...liars" is that Bush operatives are crooked...liars. Today's papers provide us with the most recent proof of same:
"OFFICIAL SAYS HE WAS TOLD TO WITHHOLD MEDICARE DATA" "The government's longtime chief analyst of Medicare costs said yesterday that Bush administration officials threatened to fire him last year if he disclosed to Congress that he believed the prescription drug legislation favored by the White House would prove far more expensive than lawmakers had been told."
"Richard S. Foster, a nonpartisan Department of Health and Human Services official who has been Medicare's chief actuary for nine years, said he nearly resigned in protest because he thought the top Medicare administrator, and perhaps White House officials, were acting against the public interest by withholding information about how much changes to the program would cost. 'Certainly, Congress did not have all the information they might have wanted, or that we had,'Foster said in an interview."
http://news.yahoo.com/news?tmpl=story&u=/washpost/20040313/pl_washpost/a54524_2004mar12
Or perhaps the Nov. 20, 2000 issue of Newsweek magazine addresses this matter best: "After Bush lost the New Hampshire primary to John McCain, the (Bush) campaign was ready to go negative...Voters were told that McCain was a liar, a hypocrite, a philanderer and a jerk. They were told he was not a hero at all but a Manchurian Candidate, brainwashed or broken in captivity and sent home to betray his comrades in arms. They were told he had had affairs, illegitimate children, that he infected his wife with a venereal disease and that he had sex with hookers."
http://www.findarticles.com/cf_dls/m4PRN/2000_Nov_12/66862415/p1/article.jhtml