Gov. John Hickenlooper on Monday quietly removed the final barrier to legalization by declaring that an amendment passed by voters in November was officially part of the state constitution. He announced the move on Twitter and email after the fact. In response, a handful of marijuana activists celebrated by toking up on the Capitol steps, but there were no crowds and little fanfare. It was a different scene in Washington state, which last week became the first state to legalize marijuana. There, activists counted down to legalization outside Seattle landmarks such as the Space Needle. Colorado officials wanted no such revelry.