UPDATE: The St. Louis Post-Dispatch has published their full story on Rep. Todd Akin's multiple arrests. You can read the story, in its entirety, here.
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In an email exchange released by Todd Akin's spokesperson, Rick Tyler (he of calling Sen. Claire McCaskill a "Bullshitsu" claim to fame), Kevin McDermott of the St. Louis Post-Dispatch reveals that Akin has been arrested not once as his campaign has acknowledged, but multiple times:
ST. LOUIS – Congressman Todd Akin was arrested at least four times in the 1980s during anti-abortion protests, not just the single time he has publicly acknowledged, the Post-Dispatch has learned.