This is part of a general phenomenon dubbed "Smart Mobs" by Howard Rheingold, author of a book by the same title, in which modern communications and social-networking technologies allow quick coordination among large numbers of people who don't know each other.
As word spread, people got interested in picking a common date for nationwide protests, and decided on today, Tax Day, as the date.
There's good news and bad news in this phenomenon for establishment politicians. The good news for Republicans is that, while the Republican Party flounders in its response to the Obama presidency and its programs, millions of Americans are getting organized on their own. The bad news is that those Americans, despite their opposition to President Obama's policies, aren't especially friendly to the GOP.
When Republican National Committee Chairman Michael Steele asked to speak at the Chicago tea party, his request was politely refused by the organizers: "With regards to stage time, we respectfully must inform Chairman Steele that RNC officials are welcome to participate in the rally itself, but we prefer to limit stage time to those who are not elected officials, both in Government as well as political parties. This is an opportunity for Americans to speak, and elected officials to listen, not the other way around."
Likewise, I spoke to an organizer for the Knoxville tea party who said that no "professional politicians" were going to be allowed to speak, and he made a big point of saying that the protest wasn't an anti-Obama protest, it was an anti-establishment protest.
But it's more likely that the tea-party movement will have an impact on the 2010 and 2012 elections, and perhaps beyond.
This influx of new energy and new talent is likely to inject new life into small-government politics around the nation. The mainstream Republican Party still seems limp and disorganized. This grassroots effort may revitalize it. Or the tea-party movement may lead to a new third party that may replace the GOP, just as the GOP replaced the fractured and hapless Whigs.