Despite the recent attempts of the George Orwell led Democrat party to rewrite history, support for invading Iraq crossed over party lines very strongly.
The resolution (HJ Res 114) to authorize the use of any and all military force that the President deemed necessary was 296-133 in the House and 77-23 in the Senate. That's incredibly strong bipartisan support, given the makeup of the dims in Congress.
Maybe I wasn't clear... I wasn't referring to elected officials.