As the Ol' Perfessor (Casey Stengel) would say, "You can look it up."
Here's what then-Senator Obama had to say in 2005 about reforms in the Temporary Assistance for Needy Families (TANF) welfare program that he and other Democrats opposed:
“The TANF program affects millions of American children and families and deserves a full and fair debate. Under the rules, the reconciliation process does not permit that debate. Reconciliation is therefore the wrong place for policy changes and the wrong place for the proposed changes to the TANF program. In short, the reconciliation process appears to have lost its proper meaning. A vehicle designed for deficit reduction and fiscal responsibility has been hijacked to facilitate reckless deficits and unsustainable debt.”
Yep -- he was against it before he was for it.