Vulnerable Sen. Claire McCaskill (D-Mo.) launched an effort today to underline her commitment to veterans issues with a video and website.

The push on these issues emphasizes one of McCaskill’s key lines of messaging to voters so far this cycle as the former Missouri auditor works to remind them of her brand as a watchdog.

Without a clear opponent — the three Republicans looking to take her on in November are locked in a nasty primary — McCaskill has focused on attacking the third-party groups that attack her and burnishing her credentials on veterans issues.

The new video features McCaskill’s mother, Betty Anne McCaskill, talking about the Senator’s response to the scandal at Arlington National Cemetery.

“Claire came home and says, ‘Mother, you’re not going to believe this. They’ve been burying soldiers who fought in the war in the wrong graves in Arlington.’ I said, ‘What?!'” the older McCaskill explains. “I said, ‘There’s no excuse for it!’ And she says, ‘I know and we’re going to get that corrected.'”

“Claire’s spent her career trying to make sure our priorities are in the right place, and this is a very vivid, personal example of the work Claire has done to try and right the wrongs she’s discovered in Washington,” a McCaskill campaign insider said in an email.

One of McCaskill’s first television spots this cycle was also about her stance on issues relating to veterans.

Considered one of the most vulnerable Senators up for re-election this cycle, McCaskill will face the winner of the GOP primary between businessman John Brunner, former state Treasurer Sarah Steelman and Rep. Todd Akin.

Roll Call rates the Missouri Senate race as a Tossup.

Here’s her earlier ad about vets: