Explaining Disparities in Democrats' Delegate Tallies
Since Tuesday, different news organizations have been reporting various different tallies of delegates for each candidate, with some putting Barack Obama ahead and others Hillary Clinton.
Democratic strategist Tad Devine, who is not affiliated with any presidential campaign this year and is an expert on the party's system of awarding delegates, explains why the disparities are so significant.
Devine talks with Robert Siegel.
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