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There can be many reasons why this is happening, but these are the two greatest.
(1) As people grow older, the majority of them get to be conservative.
(2) Therefore, the minorities are voting more GOP than before. The Democrats know this and are trying to get other groups of younger people to vote. For example. The effort to allow people in Jail/Prison to vote. Lowering the Voting age to 16. Allowing Non-US people to vote. By giving Non-US people drivers licenses, they can go down to the local Motor Registration and get a Voters Registration card and fill it out.
As you can see, the Democrats know this and are trying to combat it by allowing NEW groups to vote.

Similar thing is happening with the Homosexual community. NO Flames here. Just stating fact. The Homosexual community are passing away at a higher rate than the Non-Homosexual community. Therefore, to continue to be a force in US Politics, they have to increase their population. By definition, Homosexual partners are of the same sex and cannot reproduce. Unless, two women go down to the bank or get a friend to help out. But even this is not enough.
So they are trying to get more young people interested. So where are most of the young people today? In school. Now they have a capative audience and can discuss things that parents are not even aware of.
Also, the media (film, TV, people) are very helpful if a person wants to be a Homosexual.
So you see they are also very aware of what is happening and are trying to increase their ranks/power.