Clinton's worst margins average to be her winning by 2.75%. This gives her an electoral victory of:
Just for the sake of comparison, going back another poll farther, Fox news released a poll with Bush up by 1% nationally. This one appears to be a strange sample since it has Ted Cruz and Mike Huckabee closer to Clinton than Scott Walker. That being said, it's better than the poll before that which puts an 18% spread between Bush and Walker. Regardless, I plugged in the 1% victory for Bush in the popular vote for the sake of comparison.