Rep. Marlin Stutzman, R-3rd, has scored a 100 percent rating with the American Conservative Union for his voting record last year.

Stutzman was among 41 federal lawmakers – seven in the Senate and 34 in the House – to receive a perfect rating from the ACU, which calls itself the nation’s oldest and largest conservative organization.

Stutzman also scored 100 percent in 2011, his first full year in Congress.

Former Rep. Dan Burton, R-5th, scored 100 percent for 2012. Republican Gov. Mike Pence, who last year represented Indiana’s 6th District in the House, scored 100 percent but missed votes on four of the 25 bills that lawmakers were graded on and thus did not qualify for the ACU’s Defender of Liberty award, given for a perfect score with no more than two missed votes.

The ACU reviewed lawmakers’ votes on legislation in such areas as tax cuts, domestic energy production, environmental regulations, government subsidies and religious freedom.

Pence finished his 12-year House career with a 99 percent conservative rating. Burton compiled a 97 percent score over 30 years.

Former Sen. Richard Lugar, R-Ind., scored 64 percent last year and nearly 77 percent for his 36-year career.

Lugar’s successor in the Senate, former Rep. Joe Donnelly, D-2nd, scored 58 percent last year and 34.5 percent for his six years in the House.

Sen. Dan Coats, R-Ind., scored 80 percent last year and has a career score of 89.5 percent spread over his 12 years in the Senate and eight years in the House.

Another conservative group, Americans for Prosperity, issued scores and letter grades for members of the 112th Congress, covering selected votes taken in 2011 and 2012. Stutzman and Pence scored 96 and Burton scored 95 for A’s, Coats scored 86 for a B, Lugar scored 69 for a C, and Donnelly scored 13 for a D.