We first got an indication that Google Now would begin to include election-based content in late September, thanks to the handy UnleashTheGoogle root tool. Now it looks like the "Election Information" cards are appearing for users based in the United States, where the midterm elections will be held next month. (For international readers: those are the ones that elect all the members of the House of Representatives, some members of the Senate, and various state and local offices, but not the President.)
Like most of the content that appears on the Google Now page, you can activate the Election Information card just by searching for relevant pages via the Google Search application.
Google Now Has Started Displaying Cards For The 2014 US Midterm Elections was written by the awesome team at Android Police.