http://story.news.yahoo.com/news?tmpl=story&cid=694&ncid=703&e=3&u=/ap/20040201/ap_on_el_pr/polls_behind_the_numbersWASHINGTON - John Edwards (news - web sites) and Wesley Clark (news - web sites) are offering the main challenges to John Kerry (news - web sites)'s dominance in the states that hold presidential contests Tuesday.
More than a fifth of voters in Arizona, Missouri and South Carolina say they remain undecided, suggesting a volatility that could still affect the races.
_Edwards gets strong backing from South Carolina whites who say they'll vote in the state's primary, and he gets a boost from those concerned about the economic costs of foreign trade to their state, according to polls. The sizable black vote in the state is split among several candidates.
_Clark is giving Kerry a strong challenge in Oklahoma, based largely on the retired general's support among men and from voters in more rural areas. Kerry leads in Arizona, but Clark is within striking distance.
_Kerry has a strong lead in Missouri with broad-based support from most voter groups. He also leads in North Dakota.
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