addition, there were new rules ensuring that party meetings in non-rural areas were held on uniform dates, at uniform times, and in places of easy access and that adequate public notice of all party meetings concerned with delegate selection was posted. Among the most significant of the changes were new quotas mandating that certain percentages of delegates be women or members of minority groups. As a result of the new rules, subjects that were previously deemed not fit for political debate, such as abortion and gay rights, now occupied the forefront of political discussion. The new rules for choosing and seating delegates created an unusual number of rules and credentials challenges. Many traditional Democratic groups such as organized labor and big-city political machines had small representation at the convention. Their supporters challenged the seating of relative political novices, but for the most part were turned back by the supporters of McGovern, who during the presidential primaries had amassed the most delegates to the convention by using a grassroots campaign that was powered by opposition to the Vietnam War. Many traditional Democratic leaders and politicians felt that McGovern's delegate count did not reflect the wishes of most Democratic voters. Georgia Governor Jimmy Carter helped to spearhead a "Stop McGovern" campaign, while at the same time trying to become McGovern's candidate for vice president. The stop-McGovern forces tried unsuccessfully to alter the delegate composition of the California delegation. The Illinois primary required voters to select individual delegates, not presidential candidates. Most Illinois delegation members were uncommitted and were controlled or influenced by Chicago Mayor Richard J. Daley, the leader of the Chicago political machine. The delegation was challenged by McGovern supporters arguing that the results of the primary did not create a diverse enough delegation in terms of women and minorities. The credentials committee, headed by Patricia Roberts Harris, rejected the entire elected delegation, including elected women and minorities, and seated an unelected delegation led by Chicago Alderman William Singer and Jesse Jackson, pledged to George McGovern. The California primary was "winner-take-all", which was contrary to the delegate selection rules. So even though McGovern only won the California primary by a 5% electoral margin, he won all 271 of their delegates to the convention. The anti-McGovern group argued for a proportional distribution of the delegates, while the McGovern forces stressed that the rules for the delegate selection had been set and the