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The youth vote already makes up the largest portion of voters because the younger people generally outnumber the older people. (with exceptions for places like Japan) It isn't that the youth don't have the numbers, it is more that the youth don't have any power. Money and favor is the name of the game, and young people have neither to give hence politicians don't care about appealing to them because appealing to business and trade partners provides better returns. This is turn makes the youth disillusioned and apathetic at election time.
The reason that the youth vote is barely relevant is that, despite having the numbers to actually affect change, the overwhelming majority of under-30 voters simply don't bother to vote. If the idealism of youth could be channelled, demographics would force politicians to actual "pander" to the youth vote. Currently, the only demographic that consistently votes are those over 45, who are more concerned with maintaining the status quo than with any sort of altruistic notions.
That is how so many Republicans manage to hold seats in Congress despite actually voting for bills that are not in the best interests of the majority of the electorate. If only 50-60 percent of eligible voters actually vote, and the vast majority of them are over 45, there is little wonder as to the current state of democratic politics and governance.
The only real way to make your voice heard in a democracy is to actually vote, encourage others to vote and, especially in Congressional district voting, change can be made. Imagine how congress would change if say, 85 percent of under 30 voters made their voices heard via the ballot? Hell, there may be a whole new batch of independants sitting in congress, actually voting their conscience and that of their constituents, instead of the party line.
Bitching about it and not voting and actively participating in the process is stupid.