Oregonians should see this purported tax on corporations as another attempt to implement  a sales tax but without any purchase exemptions. First, this is not a tax on corporate profits but on sales. Except for border areas where consumers have a free choice to shop across state lines ALL the places you spend most of your money will be able to directly pass this added cost on to you, as most of their competitors are in the same boat. Not just Walmart but Winco, Walgreens, & Guaranty, and on down the line.  As for gas for your car, maybe there is still a small one owner station with sales under $25 million but he for sure be buying from a distributor who will be adding it to his sales. 
Second, unlike an actual sales tax with provisions for resale - to prevent double taxation - the corporate sales tax could easily multiply. A grocery store often buys from local businesses, the local beverage distributors for instance. Their 2.5% increase would be added to Safeway's 2.5% increase.