Explains the democrat winning the popular vote in 6 of the last 7 presidential elections.
http://www.gallup.com/poll/211817/democratic-edge-party-affiliation-seven-points.aspx
Politics
June 6, 2017
Democratic Edge in Party Affiliation Up to Seven Points
by
Jeffrey M. Jones
Story Highlights
- 45% of Americans identify as Democrats or lean Democratic
- 38% of Americans identify as Republicans or lean Republican
- Largest Democratic advantage since April 2015
WASHINGTON, D.C. -- In an encouraging sign for the Democratic Party's election prospects in 2018, its edge in party affiliation over the Republican Party has grown to seven percentage points, the largest it has been in over two years.
http://www.people-press.org/2016/09/13/2-party-affiliation-among-voters-1992-2016/
2. Party affiliation among voters: 1992-2016
Overall, 48% of all registered voters identify as Democrats or lean Democratic compared with 44% who identify as Republican or lean toward the GOP.