Fired-up moms, bedecked in bovine gear no less, plan to mass in the Hart Senate Office Building at 10:30 a.m. Tuesday before stomping into members’ offices to stump for expanded gun control laws.

The expected 40-odd participants in the MomsRising lobbying day will be canvassing Congress to express their support for the background check legislation originally advanced by Sens. Joe Manchin III, D-W.Va., and Patrick J. Toomey, R-Pa., that was ultimately defeated by the full Senate in April.

The group aims to huddle with Manchin-Toomey supporters and potential swing votes, dropping off novelty key chains along the way urging lawmakers to “get mooo-ving on gun safety.”

Confidence is low that the goofy keepsakes will sway pols more than, say, the millions of dollars the National Rifle Association has poured into campaign coffers or the vote-scoring threats issued by gun-friendly conservative groups.

But they do reclaim some of the cute-bovine meme from the conservative-leaning Chick-fil-A crowd.