Students learn what factors members of Congress consider when deciding whether to vote for a bill. These include the powers given to Congress by the Constitution, members’ personal opinions, political party support, and what voters think. During the first day of the lesson, students find out about each of these factors. During the second day, students get to try their hand at weighing the factors by considering hypothetical bills.iCivics is the vision of Sandra Day O'Connor. In order to access the content on the iCivics site, you will be asked to create a free account.