Senate Republicans' refusal to even consider a Supreme Court nominee is "shocking," Sen. Elizabeth Warren said Wednesday, accusing the GOP of caving to extremists. Warren delivered that message on the Senate floor after a number of Republicans reiterated their intention to ignore any nomination President Barack Obama makes to replace the late Justice Antonin Scalia. Not long before Warren Spoke, Sen. Tom Cotton (R-Ark.) had argued that taking up a nominee would trample the Constitution because Obama is a "lame duck president with a stale mandate." Warren denounced that position in an impassioned speech of her own, saying that exactly the opposite was true.