Massachusetts Gov. Deval Patrick has certified the results of Scott Brown's upset Senate election win.
The move clears the way for the Republican to succeed the late Democrat Edward Kennedy.
As the 41st Republican member of the Senate, Brown provides the GOP with the exact number of votes necessary to filibuster Obama administration initiatives.
The newly elected senator is now heading to Washington, D.C. to be sworn in on Thursday. Brown had originally planned to take office Feb. 11. However, following criticism from some conservatives about the delay in replacing Kennedy, Brown demanded the date be moved up a week.
"The 11th was a tentative date based on the information we were getting from the secretary of state's office as to what he would need for certification," Brown explained.
"When he called me a couple days ago and indicated he would have it ready yesterday, we obviously moved our plans up because it's been a couple of weeks and it's time to get to work," he said.
Within the next week the Senate is expected to vote on two of President Obama's nominee - one to the National Labor Relations Board and another to the General Services Administration, Fox News reports.