I just visited the Las Vegas Review Journal and entered "Righthaven" into their search window. And I got back nada. Zero returns. I tried it again, using each of their suggested time-frames. Again, no returns for "Righthaven", or right haven, or a couple of other combinations.
I do realize that this means practically nothing, but it did seem odd to me, especially since I've seen the name used in their editorials. Including the word "righthaven", along with all the usual naughty words in the blocked list, does seem a bit odd.