"Under my plan of a cap and trade system, [energy prices] would necessarily skyrocket. Even regardless of what I say about whether coal is good or bad. Because I’m capping greenhouse gases, coal power plants, you know, natural gas, you name it — whatever the plants were, whatever the industry was... [t]hey will pass that money on to consumers." --Barack Obama, 1 November 2008
This graph depicts gas prices since the inauguration of Barack H. Obama.
After years of searching, I've finally discovered a campaign promise that Obama actually followed through with.