Washington CNN  — 

Sen. Elizabeth Warren isn’t running for president – but that’s not stopping her from taking a swing at a leading likely Republican presidential candidate.

The progressive senator from Massachusetts on Monday night knocked Wisconsin Gov. Scott Walker for calling for a Constitutional amendment that would allow states to ban gay marriage.

READ: Republicans pivot from gay marriage to religious liberty

“Well, Scott Walker, if you believe the next president’s job is to encourage bigotry and to treat some families better than others, then I believe it is our job to make sure you aren’t president,” Warren said while speaking at a fundraiser for Connecticut’s Democratic party.

Walker’s campaign-in-waiting certainly isn’t disappointed in the Warren knock, instead chalking up the attack to Walker’s “record of success” and the threat he could represent to Democrats hoping to hold onto the White House in 2016.

“Between Elizabeth Warren and Bernie Sanders already attacking and more to come from President Obama in Wisconsin later this week, it’s clear Governor Walker’s record of success - his big bold reforms that have changed life for the better in Wisconsin - has the Democrats worried,” Walker spokeswoman AshLee Strong said Tuesday in an email.

Warren has repeatedly been teased by progressives as a potential Democratic presidential contender – a more liberal alternative to frontrunner Hillary Clinton.

But Warren has repeatedly rebuffed those calls, so much so that the Draft Warren movement finally called it quits earlier this month.

Warren will still be a presence in 2016 regardless, using her influence – and her still withheld endorsement – to push Clinton to the left on certain issues.