"Warrantless wiretaps" refers to the program authorized by Bush in 2001 to do these wiretaps without ever notifying the FISA court.
What Obama was campaigning against in 2008 was the executive branch deciding what it could and could not do in regards to surveillance in secret without any input from the legislative or judicial branches.
What is being done now is under the FISA, an act passed by Congress and just re-authorized in 2012, and a law that the courts have upheld (at least, when they've allowed a lawsuit in the first place).
I am not defending the practice, but let's at least be strict about the terms we use. Surprisingly, no one in the government seems to mind a wiretap that has a warrant behind it.