[calcowgirl]

“Republican In Name Only” is an ostensible registered Republican who, when it comes down to it, refuses to vote for the REPUBLICAN nominee. Hence the qualifying term, “In Name Only”.

"RINO" was adopted by California GOP grassroots in 1994 who wore RINO buttons to denounce Los Angeles Mayor Dick Riordan's leftist policies and his staff and commission appointments. It had nothing to do with support of other candidates.

[aligncare]

Others seem to have expanded the meaning to refer to anyone who isn’t in 100 percent agreement with them.