George Allen snagged the endorsement of the American Conservative Union Wednesday, adding to his credentials as the frontrunner in next month’s Republican primary for U.S. Senate.

Former Virginia US Senator George Allen greets attendees at the 64th annual Wakefield Shad Planking in Wakefield, Va., Wednesday, April 18, 2012. Allen is running for the Republican nomination for US Senate. (Steve Helber/AP)

Allen is expected to face fellow former governor Timothy M. Kaine (D) in November in the contest to succeed retiring Sen. James Webb (D). But first Allen must get past three GOP foes on June 12, all of whom have accused him of being insufficiently conservative.

“George Allen is the clear choice for conservatives who want to win in Virginia this November,” ACU chairman Al Cardenas said in a statement issued by the group. “George Allen’s lifetime American Conservative Union rating of 93 while serving in the Congress shows a consistent commitment to conservative principles on a wide range of issues.”

Allen is in a commanding position ahead of the primary. A Washington Post poll released this week shows him leading among likely GOP primary voters with 65 percent of the vote. Del. Robert Marshall (Prince William) is next with 12 percent, while former Virginia Tea Party Patriots head Jamie Radtke gets 5 percent and Chesapeake minister E.W. Jackson gets 3 percent.

Democrats pounced on Allen for the ACU endorsement, focusing on the conservative group’s support for cutting government funding for Planned Parenthood.

“We deserve better than a Senator who aligns himself with right-wing groups that want to turn back the clock on women’s health,” said Virginia Democratic Party Chairman Brian Moran.