Is It Ok for McCain to Put Lipstick on a Pig?

http://digg.com/2008_us_elections/McCain_refers_to_Hilary_s_Plan_as_Putting_Lipstick_on_a_Pig?OTC-em-st1 ---"McCain refers to Hilary's Plan as "Putting Lipstick on a Pig"John McCain in Iowa on 10/11/2007 referring to Hillary Clinton's health care plan as putting "lipstick on the pig, but it's still a pig"