Here is the math that I just started to do - we currently have about 177 republicans in the House - a 66% 2/3rd house majority is about 285 - So, if we get a Tsunami in this election and take over 108 house seats, then guess what? Obamacare CAN BE FULLY REPEALED!~
But it would be mathematically impossible to win a 2/3rds majority in the Senate even if we won every single seat up for election this cycle.