There are some of my brothers and sisters in the progressive wing of the Democratic Party that still like to say there is no difference between the two parties, and that's why the Democratic Party must move much farther to the left. While I would like to see more progressive ideas passed in Congress, it's just not true that there is no difference between the parties.
As the chart above shows, there is a huge difference. On issues important to most Americans, the Democratic Party votes to help most Americans (consumers, voters, middle class, working class, etc.), while the Republican Party votes to help the rich and the corporations.
I am proud of what this chart shows about how Democrats have voted in the last few years (2014, 2015, and 2016).
The chart is from politicsthatwork.com.