@IcyGrillz
1) I don't think you understand what centrism is about. But more importantly;
2) If you expect centrists to turn republican/conservative, don't. Most centrists these days are centrist because what is considered the mainstream left has turned too extreme for them. Relative to immense political divide that currently exists, they may be in the center. But in reality were/are on the moderate left.
You can use them to push for certain policies, but don't try to turn them to conservatives, because it won't happen. And you shouldn't even want to anyway, because it would just end up diluting the right wing.