You are buying Don's propaganda. The UAC has actually moved right since it's inception.
Isn't that more to do with the fact that the UAC started off reasonably left of centre anyway - then took a large lurch to the right with the introduction of the nomadic GOP support, which caused the centre leftists like myself and ILV to leave, putting it firmly in the right. With the revival of the GOP its no surprise that their nomadic supporters return from whence they came, moving the party back to the left. Just not quite to where they began.