This is more than just making an issue of a handful of judges.
1/3 of Bush's Circuit Court nominees have been filibustered, the worst record of any President since Roosevelt.
The Democrats will filibuster any judge which they deem to be a threat to their liberal activist, through the courts, agenda.
There really is no other way for them to advance their agenda other than through the courts, hence the fight.
If this is the case with the Democrats that they cannot advance their agenda any other way than through the unconstitutional use of activism from the bench, then they need to close shop and disband as a party.
You said "1/3 of Bush's Circuit Court nominees have been filibustered, the worst record of any President since Roosevelt."
It would be useful if you could reference the source of your information.