Depends on who is asking the question, and what day it is.
Mid-October 2003: “I will fight to keep tax relief for married couples.”
Late-July 2003: “I fought hard to get rid of the marriage penalty.”
Mid-June 1998: Kerry voted against eliminating the Marriage Penalty relief for married taxpayers with combined incomes less than $50,000. (S. 1415 CQ Vote #154)