The meaning of Mainstream- the mainstream- "a prevailing current or direction of activity or influence*
*Merriam Webster's Collegiate Dictionary.

(In politics, 'mainstream' means whatever the poster wants it to mean).

Ebbie- and all other posters- may wish to take advantage of parts of a statement added to all of a certain lawyer's electronic transmissions.

"The contents of this electronic mail transmission including any files transmitted with it is confidential, may be an attorney and client communication and if so is therefore PRIVILEGED, in any event intended to be CONFIDENTIAL and for the sole use of the designated recipient. It is also sent on a "Without Prejudice" basis and use, dissemination or copying of the content is strictly probibited unless written authorization, separately received, has been given. If this message has been misdirected, or you are not the intended recipient or if a resend is desire, please contact the sending office as soon as possible."

OK, that is not pertinent, but it came to mind.