According to the Merriam-Webster Dictionary, tyranny is defined as oppressive power; especially: oppressive power exerted by government; the tyranny of a police state.
Under Obama's administration one of the examples of tyranny that we have seen in the last four years is the takeover of the auto industry (GM and Chrysler). This was done as a political payback to the unions.
The second one that comes to my mind is Obamacare, a takeover of the health industry. When the government controls your health they have complete control over your life. And in this takeover they are mandating that the Catholic Church must provide contraception and abortion services whether they want to or not. This is a violation of the First Amendment concerning religious freedom. That is a tyranny.
The third form of tyranny that we are seeing from the Obama administration is the massive amount of debt that Obama has piled upon us. "There are two ways to conquer and enslave a nation. One is by the sword. The other is by debt" -- John Adams, 1826.
There are many other forms of tyranny that are being brought forth by this Obama administration. I've listed just a few of them so that you can make your own decision when you go to vote. Do you want more tyranny or do you want freedom?
"When the people fear their government, there is tyranny; when the government fears the people, there is liberty." -- Thomas Jefferson.