I think this is a really interesting quote. Sometimes we get caught up in the Democrats vs. Republicans battle, when the true reason why we elect certain people to positions of power is to guide the country that will make things better, whether that be for a group of people or for everyone. Knowing that many more people are either Independent or unaffiliated with any political party, getting those people to vote a certain way usually helps whoever is running win. It's not just about getting your own party to the polls, but also in having people not from your party believing in your message and voting for you too.
I think there is definitely something to be said for the cult of personality that President Obama has created and tended to. From my own personal experience, it seems as though many politically active citizens view him as a figurehead not only for the Democratic party, but for Liberal and Progressive ideals and values as well.
Many political leaders have been known to harbor dogmatic personality traits to bolster their appeal to those who vote elect them into power. In the same way that charisma, passion, and antisemitism launched Adolf Hitler into political stardom in Germany in the 1930's, George Washington's military background and general leadership capacity also acted to assert his role as President of the United States.
While it may not necessarily be good for the Democratic party to be completely synonymous in platform with Barack Obama, the President's following based on his personality directly benefits his career and political capacity.