Sen. Richard Burr (R-N.C.) has endorsed Mitt Romney, his campaign announced late Thursday morning, an unsurprising move considering Burr's past criticism of top rival Newt Gingrich.

"Governor Romney's proven leadership and his track record on issues of vital importance such as reducing government spending and creating jobs are exactly what we need to put Americans back to work, reduce our spending and address our national debt, and put our nation on the path to economic prosperity," Burr said in a statement.

The North Carolinian has long been critical of Gingrich, who he served with in the House. "He's a guy of 1,000 ideas, and the attention span of a 1-year-old," Burr told The Hill in April. "His discipline and his attention to any individual thing is not his strong suit."

Burr is the latest in a long string of elected officials to back Romney since Gingrich gained momentum. Romney now has 61 endorsements from federal lawmakers, while Gingrich has eight and Rick Perry has 13.

Click here to see The Hill's full list of 2012 GOP lawmaker endorsements for president.