Glyn Moody links to a post at the Trust the Vote Project that answers that question in the negative. The devil in the details seems to be very particular clauses around procurement of voting systems that simply are not addressed by any existing open source license.
There has been a great deal of discussion about how open systems might fair better in addressing the various technical problems that have plagued digital voting software and hardware. Taking a close look at the actual legal requirements is going to be necessary and that someone is doing so is promising.
I think the selection of MPL makes sense as a starting point. If memory serves, it was intentionally designed to make it suitable for some amount of tailoring. It is also a commercial software friendly license which may provide some traction in addressing some of the issues Trust the Vote raises around copyright assignment where a given project is state funded.