Did Dems purosefully sabotage Foley?

I have not kept up with the Foley situation for lack of time. I am wondering who decided to come forward about the emails Foley sent the young pages. The news story, whose link I'll attach to this question at the end, says that some of the emails are a year old, some older. Why is this development coming out now, a little over a month before midterm elections? No recognizable republican can take his place in the election with a clear hope to win. Is this a Democrat ploy to hake the voters' faith in the GOP?