It depends on what type of intelligence.
If we're talking about pragmatic realism, then yes, centre ground would be.
Those more to the left maybe don't have that realism as much, and their ideas are more radical, but that doesn't necessarily make them bad or unintelligent. Look at some of the things that in the past were considered totally crazy suggestions yet nowadays are accepted truth. Woman/blacks/poor being as intelligent and capable as men/whites/rich, homosexuality and same sex marriage, not running society for the benefit of a group of elites, climate change. All of these would have been considered totally radical nonsense at one point, but have steadily moved into being the norm.
I consider myself a bit in the last group, as I have quite radical ideas. But I also know that there would every attempt made to scupper them by those with a vested self interest and a lot more power and influence than me. Some would need 'ducks lined up' and two or three different things occurring simultaneously to be effective when it's nigh on impossible getting just one through. Add in the natural suspicion and fear of anything different and people playing on those fears and I know I can't win, even if I'm confident what I'm suggesting would be an improvement on how things are.