1. A political yard sign can be prized by a collector based on how much historical value that it might have.
The historical value of a political yard sign can determine how sought after it is by a collector. For example, many individuals in this hobby might desire a "Mondale/Ferraro" yard sign because Mrs. Ferraro was the first female vice-presidential candidate on a major ticket. Sometimes individuals will desire to collect a yard sign that promotes Barack Obama during is first presidential run. Finally, another yard sign that is a highly desirable is a Paul Wellstone yard sign because of the fact that he was killed in a plane crash.
2. A political yard sign can be prized because of certain unusual characteristics surrounding it.
One popular collecting practice among these hobbyists is to collect signs that have interesting names associated with the office that is being sought. For example, a collector might exhibit a strong interest in a sign for "Hurt-U.S. Congress", a marker for "Lawless for State Representative", or "Crook for Senate".
3. A political yard sign could be collected if you or a loved one worked in the campaign.
Sometimes people can collect signs because they have sentimental value and nothing more. If a person worked for a given campaign, they may desire to save the yard sign as a memento of the work that thy did for that candidate. Indeed, a lot of people who decide to collect political memorabilia get their start in this manner.