Should Oregon require genetically altered foods to be labeled as such? Oregon voters will decide Nov. 4 when they cast votes on Ballot Measure 92

In the meantime, you can track the millions of dollars pouring into the Yes and No campaigns with our new GMO interactive map and searchable database, designed by The Oregonian's Mark Friesen.

On the map, zoom in or out, and click on any circle to see who's giving, how much and from where. Circles are color-coded to show which side donations are going to, and they're sized to show relative amounts at a glance. Among things you'll learn: The vast majority of the money is coming from outside Oregon.

Then scroll down to the searchable tables for more detailed information on donors.

Among opponents, food manufacturers such as Kellogg Co., grocers and multinational corporations such as Monsanto are spending big to try to defeat the measure. It's the same group that successfully prevented passage of GMO labeling measures in Washington and California. In Oregon, Monsanto has given more than $1.5 million.

On the other side, supporters have spent $3.4 million. Prominent backers include Dr. Bronner's Magic Soaps, a California-based company that was also a major player in the Washington and California efforts. Dr. Bronner's has funneled more than $900,000 into the Yes campaign so far.

Check the GMO interactive tool daily for updates. And read more about exactly what the measure would do in our 2014 Oregon Voter Guide. Click on "228 races," then scroll down to "Oregon Measure 92."

-- Michelle Brence