Source : https://upload.wikimedia.org/wikipedia/en/5/55/Barack_Obama_Hope_poster.jpg

Source : http://www.ushistory.org/us/images/00010374.jpg

Source : http://www.ushistory.org/us/images/00010430.jpg

Source : http://www.sramanamitra.com/wp-content/uploads/2009/01/postergeorgewbushwordposter.jpg

Source : https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9KZrXfqnpSw3Z9eWcEozRvmJ1W4NnWMUVBY6kkfKDoANTGlo5p0lP2p6yNCbu-PqvzojtqerJLDbV42VCAMHlLkjvFu9giHr5vSR2HVKKlnHFOzwGexs55X86jEF-ebSGGAd8Y_83KYOa/s640/President+Clinton+ran+unopposed+in+the+1996+Democratic+primaries.+This+AFL-CIO+poster+showcasing+Clinton+and+Vice+President+Al+Gore+.jpg

Source : http://www.publicinsightnetwork.org/timeline/2012/conservatives/assets/Carter1980Poster.jpg

source :http://cogdogblog.com/wp-content/uploads/2012/02/nation-needs-nixon.jpg

source :http://thumbs.ebaystatic.com/images/g/weUAAOSw37tWDbTK/s-l225.jpg

source :http://americanpoliticalbuttons.com/election-of-1956/ike56pamphlet.jpg

source: http://media-2.web.britannica.com/eb-media/24/78324-004-0B226CAC.jpg

source: http://41.media.tumblr.com/c1960f8aa4e84691004698b9c251473b/tumblr_mnttwfNaIr1s7e5k5o1_1280.jpg

source :http://oldpoliticals.com/ItemImages/000009/08755_lg.jpeg

source : http://blogs.gatehousemedia.com/artandhistory/wp-content/uploads/sites/436/2014/10/Politics_HerbertHoover.jpg

source :https://s-media-cache-ak0.pinimg.com/736x/27/62/47/2762476309afbf4387ee7e87983e25c4.jpg

source : http://www.corbisimages.com/images/Corbis-BE035498.jpg?size=67&uid=f34ec7d8-4211-428a-b43c-3c9e25b93048

source : https://upload.wikimedia.org/wikipedia/commons/thumb/f/f9/1908RepublicanPoster.png/400px-1908RepublicanPoster.png

source : http://www.legendaryauctions.com/ItemImages/000093/86657_lg.jpeg