Might be well known, but unless an actual link can be shown, I tend to remain skeptical.
Post hoc ergo propter hoc is a good phrase to keep in mind whenever you start thinking of guilt by association.
The jury is still out, to me, on whether the storyline of "Tea Party = racially motivated" is true in any part or not, and the fact that it's a popular refrain amongst many media outlets makes it somewhat more suspect to me. I think there might be related concerns (ie someone who is a racist might be worried about "big bad government trying to curtail my freedom to be a racist" which is somewhat similar (but not the same) as a the Tea Party position of "big bad government is spending my money on lazy poor people instead of me".
Sounds somewhat similar to the
Salem Hypothesis. Someone who is a racist and is involved in politics at all is likely to be a Tea Party member. But someone who is a member of the Tea Party isn't (necessarily) likely to be a racist.