The tea party began right after President Obama began his presidency and began pushing laws through congress that were unpopular with many americans. "Stimulus" bills were passed and Americans were told it would stimulate the economy and the economy would recover. The bills promised to fund "shovel ready" projects such as new roads, bridges, courthouses, other public spending that would put people to work. The problem is that the government was already borowing a lot of money to do the regular stuff and the USA would have to borrow even more money to pay for the Stimulus bills. So people began to vent their frustration in online bulletin boards they began to say this is "taxation without representation" and it was just like back in the pre-revolutionary days of the Boston tea-party. They would say things like "we need to throw another tea party to get their attention." Actually I recall wirintg something like that when someone answered that they are goign to throw a tea party on April15, 2009. And on that date all around the country these small gatherings were held at townhalls and Main Streets. That's how the modern "tea party" began.
Since that time it's kind of taken on a life of it's own. It's generally made up of people who do not think the governemtn should borrow money to get in to a better financial position. The theory is that if your household was too far in debt (creidt cards, expensive cars, etc.) it wouldn't make sense to borrow more money.
Many of the people who are involved in the tea parties are small business owners and people who have always been financially conservative with their own personal finances. Like my aunt who rarely uses her air conditioner becuaes it's expensive, and has a very simple wardorbe - but she lives in a modest house that's paid off, drives a modest car that's paid for and has money in the bank. These kind of people frequently consider themselves Republicans before the tea party movement becuase they tend to be the party of fiscal conservatives. But in some areas of the country the Republican party does not like the "tea party " folks becuase they aren't part of the establishment. It's not really a political party in most parts of the country but a movement that kind of came out of no where. I think it's as much a surprise to the people who were posting complaints back in the late winter of 2009.
I have never been to a tea party event - but I was one of those original post-ers on bulletin boards back then. I've never been politically active but I do side with much of the tea-party positions and I have a number of friends who, like me never attended a political event in their life and have become very involved with tea-party emails, events, rallies, etc.
Most politician who are supported by the tea-party are people who've not been in politics before so they are not typical "political insiders" - although that's not always the case.
Does that help?