As someone who is fairly liberal (not extremely so, but fairly), I am not afraid of the Tea Party movement whatsoever. 18% of Americans support them. While that's fairly large, it's nothing that will elect a Tea Party candidate to office, considering that 62% of Americans do not support them. (Percentages cited from here.
) If the average American now represents 18% of the population, then we have sort of a Tyranny of the Minority going on. Luckily, I believe in FREEDOM and DEMOCRACY and AMERICA so I do not believe that 18% will rule the country. You can say this percentage will increase, and it probably will, but it would need to cross 40%, probably, to really dominate. Based on the general history of political movements, I don't see that happening.
As far as Obama's policies are concerned, they're moderate at best. Frankly I know many liberals who would be greatly pleased if Obama actually did half the things conservatives said he did. Frankly, he's supported a couple of pretty conservative concepts. One is the offshore drilling near Virginia, which I'm actually thrilled about since, as a geologist, that means more jobs opportunities. The 2nd is the recently passed health care bill, which has a -lot- of similarities to the Republican health care proposal put forth in 1993 titled "Health Equity and Access Reform Today Act of 1993," which was meant to be an alternative to Clinton's plan.
Also, Obama doesn't act like a dictator; to say he does is to blatantly misunderstand what a dictatorship is. If he was passing all sorts of laws into place without going through the legislative branch at all, then yes, I'd say he's acting like a dictator. If he were to completely shut down Fox News, that would be fishy. If he was shutting down all of the Tea Party protests, I would say he's acting like a dictator. Passing legislation that's been through congress that involves lots of spending and deficit increases (which was totally fine when Reagan did it, btw) is something you might DISAGREE with, but it's not dictatorship.
P.S.: I'm moving this to World Events, as it's better fit there. I'm all for a civil debate, but this isn't the place.