It happened in Kansas. State Senator Chris Steineger not only attended a tea party but was a featured speaker. And he is considering running for governor - against Brownback.
His explanation:
In the past year, I have attended and spoken at public events sponsored by the Americans for Prosperity and the April 15 taxpayer tea party. It is important for Democrats to take their message to groups of people we may not agree with, or may not know much about.
1) Millions of Americans have financial angst with the down economy, layoffs, losses in retirement accounts, and declining home values. Even before the economic downturn, millions of Americans felt as though they were not getting ahead. You don’t have to follow a wide variety of national polls over the years to understand this. Many polls show that an increasing number of Americans have little faith in either political party to improve our lives.
2) Thomas Frank in his book “What’s the Matter with Kansas?” points out that millions of Americans were attracted to right wing neo-con generated messages and voted for their candidates despite the fact that those same neo-cons ultimately enacted policies to the detriment of the folks who elected them. Many of these folks are blue collar and middle class.
3) James Carville in his book "Winning the Barbeque" argues that when at the backyard BBQ and your opponents are aggrandizing their own policies and denigrating yours, it is vitally important to stand up, speak out, defend your own policies, and advocate for their acceptance. In many sports leagues, the team that doesn’t show up to compete, forfeits the game. When Democrats don’t show up to compete with right wing hate mongers, we forfeit the chance to win over the many Americans who ARE NOT hard core right wingers, but more precisely, are economically and financially worried.
more . . . http://kansasjackass.blogspot.com/2009/04/steineger-addresses-concerns-over-tea.html