"The midterm elections are over, and it's immediately time to start looking at the 2008 presidential campaign to make money off politics," Jim Cramer told viewers of his "Mad Money" TV show Friday. He believes that Agrium ( AGU) and Mosaic ( MOS) are two "perfect plays" off the primaries. Entering "the presidential pander season," Cramer said it's time to look at Iowa, as this is where are all the presidential candidates will start going for the caucuses. He said they also will go there because corn production has become important. "The driver behind corn is the ethanol demand," Cramer said. Not only has there been a huge addition to the demand in ethanol, but also corn yields are down 1.5%. "Corn yields must come up, and money will be spent to bring them up," he said.