This guy says it wasn’t, and he has a theory as to why:
[R]ight now the conventional wisdom is that Republicans are blocking Garland’s nomination on the outside chance they can win the presidency and fill Scalia’s seat themselves; and if Clinton wins, they’ll just confirm Garland after the election, during the lame duck session. This plan will work, even if the Republicans lose the Senate, because they’ll still hold the majority until their replacements take office in January. The only way this doesn’t work is if Garland’s nomination is withdrawn. So what if the Garland nomination is withdrawn?
Look, I believe Obama nominated Garland because Garland is who he actually wants on the Court. But the Republican pitch on filling Scalia’s seat is “the voters should decide.” I’ve already explained why that doesn’t make any sense—the voters decided who should fill Supreme Court vacancies when they elected Obama. But a pitch that’s good for the goose is good for the gander. The GOP has handed Obama an excuse to withdraw Garland’s nomination the morning after the election. (Obama: “Guys, guys, you wanted to let the voters decide, and the voters have decided they want Hillary Clinton to fill this seat.”)
Do I think Obama would actually withdraw Garland’s nomination? I didn’t a week ago. But that was before we witnessed an entire week of the DNC, packed with speeches about Democratic goals and priorities—with plenty of talk about Supreme Court decisions that need overturning and plenty of promises to nominate justices who will overturn them—but not a single mention of confirming Merrick Garland.
My theory: If we get deep into August and the polls are showing not only a strong lead for Clinton but also promising leads in enough of those senate races, it will take only credible whispers of withdrawing Garland’s nomination to make the Republicans nervous enough to go ahead and confirm him before the election. And how do you create a credible threat of withdrawal? By taking the stage before millions of viewers for a week to talk about goals and priorities, and the importance of the Supreme Court, without mentioning Garland. There was an effort to rally Democratic voters behind the importance of appointing the right people to the Supreme Court—but no effort to rally Democratic voters behind Garland. Why? Because absenting Garland from the DNC was a signal. The Party didn’t commit itself to Garland. Clinton didn’t commit herself to Garland. Even Obama didn’t push for Garland. The signal: after this week, the possibility of withdrawing Garland on November 9 is real.
This is superficially plausible — and it’s certainly noteworthy that Garland wasn’t mentioned, assuming he wasn’t — but I can’t see the GOP folding on Garland right before the election even if the polls look dismal for them. That sort of show of weakness would just enrage the base further, assuming that particular dial won’t already be cranked up to 11 by then.