"If Obama had courage we would have had Merrick Garland" is a non-obvious conclusion that has widespread disagreement. If you're sure it's correct, can you post

"If Obama had courage we would have had Merrick Garland" is a non-obvious conclusion that has widespread disagreement. If you're sure it's correct, can you post your reasoning of the techniques that Obama and the Democrats could have used that would have inexorably led to Garland's confirmation? Please make the argument.