After Republican Congressman Bill Cassidy didn’t attend its candidate forum Tuesday night, the nonprofit Alliance for Good Government has thrown its support behind incumbent U.S. Sen. Mary Landrieu, a New Orleans Democrat.

“Taking positions and interacting directly with voters should be a responsibility of all people seeking office in this country, which is why I’m looking forward to participating in multiple debates and forums over the next month,” Landrieu said in announcing the endorsement Wednesday. “I just wish Congressman Cassidy had the courage to show up last night or can find the courage to show up at the first debate scheduled for next week.”

Landrieu still squared off against retired Col. Rob Maness during the quasi-debate, but both took several opportunities to note Cassidy’s absence. State Rep. Paul Hollis, R-Covington, sat in for Cassidy.

Meanwhile, Cassidy on Wednesday held an event to tout his endorsement from the anti-abortion National Right to Life.

“For the past six years Congressman Cassidy has been a strong advocate of his district, born and unborn,” said Carol Tobias, president of the group.

Cassidy, of Baton Rouge, said his record offers a sharp contrast with Landrieu.

U.S. Sen. David Vitter, also a Republican, was at the announcement to note that Landrieu has a zero rating from National Right to Life and a 100 percent rating from the National Abortion Rights Action League, which supports abortion rights. The ratings are reversed for Cassidy, he said. “It doesn’t get clearer than that,” he said.

The U.S. Senate primary is Nov. 4 and a runoff, if needed, is Dec. 6.

The Alliance for Good Government also endorsed incumbent congressmen in Louisiana’s 1st and 2nd District congressional races — Republican U.S. House Majority Whip Steve Scalise, of Jefferson, and Democrat U.S. Rep. Cedric Richmond, of New Orleans.

Follow Elizabeth Crisp on Twitter @elizabethcrisp. For more coverage of the Louisiana politics, follow our Politics blog at http://blogs.theadvocate.com/politicsblog .