I don't understand why this is so hard to understand.
The government has been abusing the taxpayer for a very long time. Ever since the income tax started in 1913. it is amazing. People did not get taxed until they made 50K, and only up to 7% (the average worker made $423/mo)
As government grows, so does spending. As spending grows, so goes taxes. Not necessarily income tax, but taxes none the less.
The current problem has been slowly building for 20+ years. It started out as a little heat, then a simmer, then a mild boil, then full fledged boiling over. It took time. A lot of these people are not typically involved in the political scene. They have finally decided they are not being represented in government, and they are fed up.
They are fed up with government, the political process, politicians, and the corruption that comes with all of it. The are people that voted republican, democrat, independent, third party, or did not vote at all.
The current message is going to the federal government. It is growing, about 200K this time around, next time who knows.
At this is not about Obama personally, this would have happened with McCain, or Clinton.
The real question is this, Why are you so happy to idly stand by and watch your children's or grandchildren's future be spent by the current generation, no matter who the president is?