"We are not the extreme," says a South Carolina Tea Partier. "We are the voters."
Nice. But it misses the strategic point.
The strategic point is that what is "mainstream" and what is "extreme" is not decided by counting noses or by being a voter. Or a bunch of voters.
This question is decided by who stands in continuity with the definining mainstream of American dignity and liberty under God, as set forth in the Declaration and U.S. Constitution.
To the degree that a Lindsey Graham stands outside of that mainstream, to that degree he is an extremist.
In this sense you can wear a coat and tie, occupy high office, have a nice hair cut, speak in soft tones, count many noses in your support, and yet still be an extremist out of touch with who we are as Americans and out of touch with who we are as beings "created equal" and endowed by our Creator with "certain unalienable rights."
As C-SPAN viewing indicates, sometimes the most insidious extremists are decked out in Brooks Brothers suits.