The country singer, who made her ballroom debut on Dancing With the Stars on Monday, March 18, told Us that though she and the Olympus Has Fallen actress don't always see eye-to-eye, she's already ready to cast her vote should Ashley decide to run for Senate in 2014.
"Of course I'd vote for her!" she said. "I don't agree with anything she says half the time. We're so different. But I love my sister. I am for Ashley."
In fact, when Ashley announced her decision to part ways with husband Dario Franchitti, 39, earlier this year, Wynonna was "one of the first people that she told."
"There were times when I was at such a valley, darkening of the soul, and she and Dario were there for me. and I'm there for Dario and Ashley," the 48-year-old singer told Us. "And they're both still as close and dear to me. And they both know it."
Ashley, 44, and Indy 500 champion Franchitti announced their decision to split after 10 years of marriage in a joint statement this past January.
"We'll always be family and continue to cherish our relationship based on the special love, integrity, and respect we have always enjoyed," the couple told Us in a statement.
Wynonna, who got married to husband Cactus Moser just last year, added that it isn't her place to judge her younger sister -- rather, she wants to act as a support.
"There are people that are going to be so surprised like, 'Well if you guys love each other so much, why are you getting a divorce?'" she said of Ashley's amicable divorce. "It's nobody's business! And I say knowing them, it's their story and they are living it so am I supportive? If they ask me opinion, I'll tell them what I think. Otherwise, I support them. Period. Individually. Collectively."
And the singer explained that her fierce loyalty is returned in kind. When Moser, 55, lost his leg in a devastating motorcycle accident last summer, Ashley was on hand to help out and lift both their spirits.
"Here's this Harvard graduate, you know, smarty-pants who's gonna change the world," Wynonna told Us of her sister. "She comes over to read to Cactus story after story, like she's in the eighth grade! It was the sweetest thing because I hadn't seen that side of Ashley in some time."
This article originally appeared on Usmagazine.com: Wynonna Judd on Sister Ashley Judd's Possible Bid for 2014 Senate Run: "Of Course I'd Vote For Her!"