To be fair the Dems only had supermajority with all votes present for about 3 months, due to illness/absence from a senior member (can’t recall his name atm), and then Ted Kennedy croaked and they chose to nominate a bland party loyalist who lost to Scott Brown, which made it 59-41, and McConnell seized on it and filibuster everything.
Which does not absolve them, or Obama in anyway, since his signature legislation was eventually passed by budget reconciliation, without needing the supermajority, and as Tortoise Mitch showed us, filibuster means nothing.