Democratic Party is one of the two major contemporary political parties in the United States, along with the Republican Party 
Do you know much about the origins of it?
Its origin could be Traced to its heritage back to Thomas Jefferson and James Madison's Democratic-Republican Party, the modern-day Democratic Party was founded around 1828
So it wasn't always called the Democratic party?
Interestingly,its the world's oldest political party.
Really, I would have thought it was the Republican party!  Have the Democrats changed their main focus over the years?
Democrats' dominant worldview was once social conservatism and economic liberalism while populism was its leading characteristic in the rural South.
I'm not so sure they are much of social conservatists these days, much more liberal on that side now I think, right?