[LetYouDown]

Spoiler below in white (I think, heh)

<font color="white">Take one person out of the equation entirely...just determine who it is beforehand.

Of the other three, there's 8 possible combinations:

Red Red Red
Red Red Blue
Red Blue Red
Red Blue Blue
Blue Blue Blue
Blue Blue Red
Blue Red Blue
Blue Red Red

The 75% jumps out because 75% of these have two of one color and one of another. So for each person...if they see Red, Red or Blue, Blue...they write down the other color. If they see a mix of both, they pass.

What they'd write (respectively)...

Blue Blue Blue (lose)
Pass Pass Blue (win)
Pass Blue Pass (win)
Red Pass Pass (win)
Red Red Red (lose)
Pass Pass Red (win)
Pass Red Pass (win)
Blue Pass Pass (win)

I tried to figure this out where all 4 people have to be involved, but I'm hitting a stumbling block and I'm not sure it can be done. Either way, the answer still doesn't break the rules.</font>