Biffo, I really have no idea what many of your posts are about, but please don't try to elucidate, I don't really want to know. And the others that I do understand, I just don't agree with you.
Ronald Reagan was a quite famous president of the USA.
he served two terms as president (1980-88) and usually tops public opinion polls in the USA when the question is: who was the greatest (or best) president?
prior to entering politics (first, as governor of California), he was a movie actor, most of the knowledgeable claiming he was a "B grade" actor.
when Reagan made his run for president in 1980, his opponent was the incumbent (i.e. bloke in the job) Jimmy Carter.
Carter ranks among the least popular president in USA's history.
Carter, previously a peanut farmer, had limited media skills.
when the two engaged in three televised debates in the 1980 campaign, Reagan used his acting and media skills brilliantly.
his greatest tactic was to say, very effusively and with a big smile, "there you go again" whenever Jimmy made a statement that was attackable in the GOP context.
it became the signature of Reagan's campaigning, both out of and in office.
Reagan used the expression to lambast Carter, usually without having to have an opinion.
subsequently, "there you go again" became a very popular expression around the world, but its use became twofold:
1. the lambast, which i prefer not to use and which is not allowed by GAGR rules.
2. as an affectionate expression that you have said something a few (or many times) previously and that i understand your point. so, i was merely pointing out that i have read your point a few times and that i empathise, although not perhaps agreeing - hence the smiley.
i am very surprised that you, living in one of the world's great centres of government and politics are not familiar with the term.
as for your disagreeing with me, wouldn't it be a very dull world if we all agreed on everything?
without offending you, may i take your disagreeing with me much (most?, all?) of the time as a badge of honour?
i do.