Were there any common themes between the elctions of 1916, 1920, and 1928?
You may find something in these sites.
http://www.google.com/webhp?source=search_app#hl=en&tbo=d&sclient=psy-ab&q=common+themes+between+the+elctions+of+1916%2C+1920%2C+and+1928&oq=common+themes+between+the+elctions+of+1916%2C+1920%2C+and+1928&gs_l=serp.3...2207529.2209203.1.2210497.1.1.0.0.0.0.108.108.0j1.1.0.les%3B..0.0...1c.1.3.psy-ab.WtErcR7gmrw&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=12948d4393918b3c&biw=711&bih=453