This is a great question. With the way the United States is going right now, our country is becoming more and more diverse. As mentioned in the above answer, as hispanics continue to increase in population, that will certainly lead to more Democratic votes come election time. Not only hispanics, but with the increase of people coming from around the globe, Asia, Europe and South America, the Democratic party's beliefs will also cater more towards those citizens. 20 years ago, a black president never seemed possible. However, thanks to where are country is moving and the diversity we continuously grow, a black president can thrive and succeed.
Aside from looking at a racial demographic however, I think another group to be on the look out for is the new tech industry. This new generation has already put a great deal of focus and attention on technological development. Companies like Google and Facebook are all digital and web based. Companies like these are constantly on the lookout for creative individuals with a desire to code, develop programs, and work exclusively on computers. It is a demographic that has propelled us into a more digital society and a more electronical business industry. At the rate at which ideas are developed and put into action, I fully expect to continue to see a lot of growth and improved performance in the field.