Those 4 people are politicians, they are party first, they will back the nominee if its Obama himself.
The TEA Party has no leaders, it can’t endorse. Most of the TEA Partiers will not support Romney.
Shouldn't they be held to a higher standard then? afterall they ran and spoke out about their conservatism, they had conservatives support them, then they'll turn around and endorse the person they ran and fought against? shouldn't that be worse in your book?
As for the Tea Party? they'll most certainly make endorsements to their local members.