Under U3, 5% unemployment is considered more or less normal. Sometimes economic booms dip below that (at which point you usually get contractionary policies to prevent inflation). But 5% will be reported as good news.

If U6 was the headline number, "normal" would be 8-9%, and that would be reported as good news. I see no reason to believe that the absolute difference between those numbers would have any effect on politics or policy.