If we stay the course with GWB's commitment, I'd have to disagree. Which other planet would we be able to perfect terraforming on?
As far as Venus goes, it's almost impossible to imagination any human habitat on that planet.
See, that's where groupthink leads you. Mars is easy enough to get to. Venus is hard. But which one has the resources to make it worthwhile? Here's a secret: Mars is a barren desert. Mars could support a science colony, but otherwise nothing is happening. Some day someone will have the chance to opt for Venus, that will be the day the direction of human history changes.