Bush criticized Clinton administration policies in Somalia, where 18 Americans died in 1993 trying to sort out warring factions, and in the Balkans, where United States peacekeeping troops perform a variety of functions. "I don't think our troops ought to be used for what's called nation-building", Bush said in the second presidential debate. Bush also pledged to bridge partisan gaps, claiming the atmosphere in Washington stood in the way of progress on necessary reforms. Gore, meanwhile, questioned Bush's fitness for the job, pointing to gaffes Bush made in interviews and speeches and suggesting he lacked the necessary experience to be president. Bill Clinton's impeachment and the sex scandal that led up to it cast a shadow on the campaign. Republicans strongly denounced the Clinton scandals, and Bush made a promise to restore "honor and dignity" to the White House a centerpiece of his campaign. Gore studiously avoided the Clinton scandals, as did Lieberman, even though Lieberman had been the first Democratic senator to denounce Clinton's misbehavior. Some observers theorized that Gore chose Lieberman in an attempt to separate himself from Clinton's past misdeeds and help blunt the GOP's attempts to link him to his boss. Others pointed to the passionate kiss Gore gave his wife during the Democratic Convention as a signal that despite the allegations against Clinton, Gore himself was a faithful husband. Gore avoided appearing with Clinton, who was shunted to low-visibility appearances in areas where he was popular. Experts have argued that this could have cost Gore votes from some of Clinton's core supporters. Ralph Nader was the most successful of the third-party candidates. His campaign was marked by a traveling tour of large "super-rallies" held in sports arenas like Madison Square Garden, with retired talk show host Phil Donahue as master of ceremonies. After initially ignoring Nader, the Gore campaign made a pitch to potential Nader supporters in the campaign's final weeks, downplaying his differences with Nader on the issues and arguing that Gore's ideas were more similar to Nader's than Bush's were and that Gore had a better chance of winning than Nader. On the other side, the Republican Leadership Council ran pro-Nader ads in a few states in an effort to split the liberal vote. Nader said his campaign's objective was to pass the 5-percent threshold so his Green Party would be eligible for matching funds in future races. Vice-presidential candidates Cheney and Lieberman campaigned aggressively. Both camps made numerous campaign stops nationwide, often just missing each other, such as when Cheney, Hadassah Lieberman, and Tipper Gore attended Chicago's Taste of Polonia over Labor Day Weekend.