Washington (CNN) – Democrats racing to protect their congressional seats also face a serious battle on their other flank: state capitals. One analyst has found that a quarter of state legislatures are in play this November, with the vast majority of the bodies at risk controlled by Democrats.

"I've been doing this for five cycles now and already we have the most chambers in play as basically at any point, going back to 2002," said Lou Jacobson, who writes for PolitiFact and recently completed an extensive analysis on state legislatures for Governing magazine.

"The other really striking thing," he said, "is this (election) is the biggest differential between the two parties."

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