When you ask such a question, you need to be specific. Research values for similar items online. Is it an original photograph, cabinet card, lithograph, or painting? Is it a reprint? See if there is any information on the back of the picture. Look for gallery information, the name of the photographer or artist. Is it a limited edition product? There is much you need to find out about your picture.
When we try to decide if something is worth trying to sell, we need to understand the research time involved. Value is not specific but personal. It may not be worthwhile to attempt to sell something for, say, $15.00 if it takes a lot of work. The same can be said if the item is something we cherish. But if we find out that a particular item is worth thousands of dollars, that changes perspective.
Research political memorabilia to learn more about your picture.