5 articles by someone who is paid to know about these things. I would say the most immediate problem is the tone of political discourse, which is turning people off in droves. But, the tone was was worse years ago when it inspired people. Go figure.
Anyway, some good insights and possible solutions to a complex problem:
http://hnn.us/articles/1104.html(an except from the first article)
"The change in party politics also helps to explain why candidates now have trouble crafting messages that voters find compelling. Candidates have never had so many communication weapons at their disposal, yet they have never found it so hard to frame their message. As Franklin Roosevelt's voice crackled into living rooms through the vacuum-tube radio, his pledge to "the forgotten man" had a persuasive power that today's media consultants would envy. Listeners didn't have to be told what FDR had in mind or to whom he was speaking. Campaign messages today are strikingly different in the wide range of issues they address, the contradictions they contain, the speed with which they turn over, and the small percentage of voters with whom they resonate. After their defeat in the 2002 midterm election, Democratic leaders were roundly criticized for failing to put out a message that captivated voters. However, Democratic politicians are neither stupid nor apolitical. If a simple and compelling message was readily available, they would have seized it. Such messages are today quite rare. If Republicans could not rely on their perennial "let's cut taxes" pitch-which is now closer to a fight song than a true governing philosophy-they would face the same problem.
A century ago, James Bryce worried that the growing complexity of American society threatened the parties' ability to forge and mobilize cohesive majorities. Social complexity is now orders of magnitude greater and has clearly overtaken the parties. The consequences include a lower rate of electoral participation."