Mark Blumenthal looks at the polling data and finds that John
Edwards' presence in the 2008 Democratic presidential race actually took more votes away from Barack Obama than Hillary Clinton.
"The biggest lurch in support over the course of the two year campaign
occurs for Obama just after Edwards dropped out (when pollsters stopped
including his name on vote preference questions). Just before the
Edwards announcement, most polls showed Obama's support in the mid-30s.
Just after, his support surged the mid-40s. Over the same period,
Hillary Clinton's aggregate support held mostly steady."
Blumenthal concludes that an earlier Edwards withdrawal from the race -- if the news of his marital infidelity became public -- probably would not have changed the outcome of the Democratic
primary.