These charts were made with numbers from the Gallup Poll. The top chart shows the people who identify as Democrats, Republicans, or Independents between 2004 and 2018. The second chart includes those who lean toward one party or the other in the same time period. The third chart shows just the last 13 months (since Trump was sworn in). Note that recently there has been a sharp move toward the Democratic Party and away from the Republican Party -- and Democrats enjoy a 15 point advantage (50% to 35%) when leaners are included.
