float: left and

I've been working on a web site redesign to use nothing by <div>'s laid
out using CSS. Seems to be working about how I expect it to, except that
some of the content in a left-hand column is hidden by a subsequent page
element rather than pushing the next element downward in FF. By contrast,
the right-hand column does push the next element downward.

Can anyone offer a suggestion as to where I might be going
wrong?

Here's the URL: www.progressivetrail.org

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