many Cubans after the Cuban Revolution. African Americans have the second highest voting rates in the United States and even surpassed white voters in the 2008 Presidential Election, although this has declined in the 2016 Presidential Election. In the 2008 Presidential Election and 2012 Presidential election, African Americans voted overwhelmingly for Democratic candidate, Barack Obama. This trend of African Americans voting for candidates of the Democratic Party continued into the 2016 Presidential Election. Women in the United States have, in the past 30 years, surpassed male voting rates, with the 2016 Presidential Election having a ratio between females and males of 52 to 48. This trend is often referred to as the Gender Gap and when combined with the tendency of women to vote for Democratic candidates, their effect on political outcomes is extremely important. Biology and political science Interdisciplinary studies in biology and political science aim to identify correlates of political behavior with biological aspects, for example the linkage of biology and political orientation, but also with other aspects like partisanship and voting behavior. This field of study is typically referred to genopolitics although it is sometimes referred to as biopolitics, although the term also has other meanings originating from the work of Michel Foucault. The study of possible genetic bases of political behavior has grown since the 1980s. The term genopolitics was coined by political scientist James Fowler in the early-2000s to describe research into identifying specific transporter/receptor genes responsible for ideological orientation beyond the sociopsychological realm of political socialisation. Other research on genopolitics includes the article entitled "Do Genes Contribute to the “Gender Gap”" which also attempts to explore genetic influences between the sexes and whether or not they contribute to political preferences. The authors concluded that “the findings support the claim that the environment (social or other) cannot be used in isolation to explain behavior differences between males and females, nor can all differences in modern political behaviors between the sexes simply be attributed to genes or presumptions about primitive man." Political participation Political scientists also aim to understand what drives individuals to participate in the democratic process, either by voting, volunteering for campaigns, signing petitions or protesting. Participation cannot always be explained by rational behavior. The voting paradox, for example, points out that it cannot be in a citizen's self-interest to vote because the effort it takes to vote will almost always outweigh the benefits