Walked decertified and defunded public employee unions in Wisconson. That's an actual accomplishmnet, and it cost him terribly, as he was subject to a recall by those same forces.
I didn't see Ted Cruz going to Wisconson or doing floor speeches to help Walker. Did you?
Cruz's pseudo-filibuster didn't actually CHANGE anything. It was sort of a 'rhetorical' defense of the Constitution, not one involving actually doing something, changing some law successfully.
I would not expect a Gov. busy with doing to take time away from that to support a Senator (from another state) busy talking about things, no matter how important the topic.
So, I think that criticism is off base.
The open borders proponent charge you make against Walker is much more important to me. Got any references for your claim?