It is too attractive to click challange proposal

[GriffGreen]

Was sitting next to someone when they were voting in the GIVgarden... they went to vote yes on a decision vote and clicked challenge proposal instead and then were very confused with the box that popped up...

I think changing the button color would fix the problem... if you make it red it would probably flow better... up to the UX peeps of course but thats an example of a simple fix