Guys, do you seriously believe he would be confirmed during the lame duck session?
Too many senate conservatives would never vote for him.
If Democrats are on board, then all they need is 14 Republican votes, maybe a couple more if a handful of Democrats do not vote/vote no.
Strategically, it makes sense to try and ram through Garland if Clinton wins/they lose Senate in November. Why not rush to confirm him then instead of letting Clinton nominate a much younger, more liberal justice that will get confirmed? The only problem here is that Republicans essentially slammed the door in their own faces with not only the strategy they chose to pursue, but also it's sloppy execution as well.
At that point, Obama should definitely withdraw Garland and let Hillary appoint the next RBG to the court.