ABC News' Amy Walter reports: A new ABC News/Wash. Post poll finds that in a head to head match-up against President Barack Obama, 70% of those who say they are Tea Party supporters say they'll vote for former Massachusetts Gov. Mitt Romney for president--compared to 69% for former Arkansas Gov. Mike Huckabee. Seeming Tea Party favorites like former Alaska Gov. Sarah Palin and Minnesota Rep. Michele Bachmann, meanwhile, draw 61% and 60%, respectively....