I would have thought the opposite...From which angle are you looking at this?
I agree because I think the left and right view being moderate as not taking a side or having an opinion. which isn't necessarily true but that's what they think
By what metric are we using the term "moderate" or "centrist?" In America, the political center in Washington D.C. has been pulled SO far to the Right that the GOP would literally refer to ideas created by Republicans as a Conservative alternative to President Clinton's policies as "Socialist" or "Fascist" (because Republicans are very stupid people who think both of these ideologies are the same thing) when President Obama was willing to entertain them.
There's already a whole party of moderates and centrists. They're called the Democrats.