A few points about your post:

1) It's not just Republicans (even though the numbers are larger because of disaffected Republicans, and some of those no longer consider themselves Republicans because of the last 8 years)
2) The noise was going on before August, but it increased due to the perceived lurch to the left it seemed like the country was going to be heading in (larger bail-outs, bigger corporate welfare, healthcare, cap and trade, etc).
3) You discredit yourself by calling them "tea-baggers." Get yourself out of the gutter.
4) You narrow your question down from January and just to "Constitutional" rights (as if rights are only granted by the Constitution).
5) There are a large amount of people involved with these groups that have been screaming for longer than the last 8 years. You just prefer to shift the argument to bring in Bush apparently.

But all those points aside...to answer your question, there are a few tenants that people are basing themselves on here (and I may not cover them all, but it's why I'm interested in the movement):

-Both parties have let us down. Republicans grew government at an out of control rate. Democrats are putting it into overdrive.
-Does anything Congress do anymore fall under it's authority granted by the Constitution? It's been shredded well before your narrow time-line. This (unfortunately for your argument) has less to do with Obama than you think.
-The proposed Cap and Trade bill would create taxes that would be passed on to citizens.
-The government takeover of private companies (shredding Constitution).
-Transparency has taken an even further back seat with this administration, but it's been suffering for many years.

You are narrowing the argument down to just Obama, but...again...I hate to tell you...it's not about Obama. It's about the government as a whole. But, at the same time, what's being proposed and what has been happening is not really going to be good for this country (and not limiting the timeline to just since January).

The better question would be:

How many times and in what ways has Congress and the President violated the Constitution in the last 115 years?

Worth noting... when many of us were protesting the PATRIOT Act's Constitutional abuses and the falsified evidence for going to war against Iraq, the self-same tea bag party said we suffered from Bush Derangement Syndrome.

I have no sympathy for their sudden need to whine.

Via Roy Edroso: Tea Party Conservatives are talking up the notion of "calling in conservative" on 7/30/09.

In a saner universe, this would be referred to as "disaffected Republicans join call for a general strike."

Please, please, please, pleeeeeeeeeeeeease do this. I would love to have a one-day vacation from the super-producers in my midst.

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Dirty deeds done dirt cheap! Special holidays, Sundays and rates!

The tea party movement has taken on a momentum of its own:
in a spiral...downward.

The key problem for the GOP is that the party can't function, in a primary sense, without some of these people, and yet it can't compete nationally, in a general sense, with these people.

By creating and nurturing this vocal, aggressive group of people over the years through talk radio and the Internet, the GOP may have created its own worst enemy for the future.

The dogmas of the quiet past, are inadequate to the stormy present.
President Abraham Lincoln 1862