As a senator, Obama voted against Justices Roberts and Alito on the basis of their ideology, Republicans say. Why can't we do the same? they ask.
Tuesday's switch by the independent-minded Pennsylvanian also helps Democrats to solidify power in the Senate.
The business community says the bill, which makes it easier for workers to unionize, would be a job killer.
Column: Children need to be protected online, but these new bills go too far.
Senate Democrats reached agreement with key Republicans Friday night on an economic stimulus measure at the heart of President Barack Obama's plan for combatting the worst recession in decades.