Kilgore resigned as Attorney General in February 2005 to run for Governor and easily won the primary election against Warrenton Mayor George B. Fitch to become the Republican nominee. In the general election, he ran against Democratic nominee Tim Kaine, the Lieutenant Governor of Virginia, and State Senator Russ Potts, a pro-choice Republican who ran as an independent candidate. Early in the race, Kilgore showed solid leads of ten points or more in the polls, but Kaine steadily closed the gap and ultimately defeated Kilgore by a margin of 52% to 46%. Kilgore's campaign was at times criticized for taking steps to avoid debates; Kilgore refused to debate Potts for the majority of the campaign, at times leaving Kaine and Potts to debate each other in his absence. He agreed to debate only with Kaine, and only if the footage could not be aired in campaign commercials. During this debate, he refused to answer whether or not he would make abortion a crime. This apparent public moderation of his previously open and hard-line stance on abortion troubled some of his conservative supporters. He was further criticized for failing to limit his negative advertisements to 50% of his campaign's total publicity as Kaine proposed. One such advertisement featured a father whose son had been murdered by a man who was on Virginia's death row; the father expressed doubt that the sentence would be carried out if Kaine were elected and alleged that Kaine would not even have authorized the execution of Adolf Hitler, based on an interview with the Richmond Times-Dispatch. The negative reaction to the mention of Hitler combined with Kaine's pledge to carry out the death penalty and explanation of his personal opposition as arising from his Catholic faith helped to neutralize what many observers thought would've been a potent issue for Kilgore. In trying to explain how a solid Republican could lose a traditionally Republican state by such a large margin, political commentators cited numerous key factors. Kaine's campaign had many political advantages, including his association with the state's popular Democratic Governor Mark Warner and defense of Warner's 2004 budget priorities, his "response ads" to Kilgore's death penalty advertisements, which featured him speaking to voters about his religious convictions, his relentless in-person campaigning across the state, and his opposition to tax increases. In contrast, Kilgore's campaign had many political disadvantages, including a backlash over the death penalty ads that Kilgore's campaign ran in the fall, the relatively low poll numbers of then-President George W. Bush at the time the election, and a bitter division between the moderate and conservative wings of the Republican party over tax and spending priorities.
