If there was a 269-269 tie, which has a very real possibility (2016 + MI + PA + ME-02) and the vote went to the house, I would assume each member would vote along party lines. I was curious so I made a map based on the current congressional delegations of each state. That results in this map -
https://www.270towin.com/maps/yJGV2Democrats would pick up Iowa and Arizona, but MI and PA have even split delegations. What would happen here? would 1 republican defect and vote for the democrat because the democrat won their state? What if they refused to break a tie? What's the process? And by the way, how are DC's electoral votes decided in this case?