I checked this and got the same thing. However, interestingly, if I added a space between the colon and Free Republic, I didn’t get it.
I am going to try to just type in Clinton Suspicious Deaths Free Republic and see what happens. I just that it and had no problem.
I get the same as you with no space after the colon (get warned) and with space after the color (no warnings).
I tried a bunch of other sites without the space and not one delivered the warning. I suspect site design problems at FR rather than something nefarious. It might be the 1995 web design.
washingtonpost.com
slate.com
democratunderground.com
salon.com
rushlimbaugh.com
time.com
nationalinquirer.com
dailycos.com
ijreview.com
infowars.com
breitbart.com