If you want the Tea Party to be an actual political party, then no matter how you slice it it will be an act of subtraction.
However, if the Tea Party is more conceptual, then its proper role is to promote ideas and legislation which shrinks government, reduces spending, and expands freedom. When those ideas are forwarded in congress, I will be happy if they pass, whether some of the votes come from homosexual baby killers or not. Does that mean I’d vote for a pro-abortion candidate? Hell no! I would not, regardless of how many spending cuts they support.
It’s not a party and shouldn’t be. It’s a coalition of citizens pushing for a return to constitutional government. Taxes are just one issue of many.