DES MOINES — Elizabeth Warren hit Joe Biden for his past stances on changing Social Security and expressed solidarity with Bernie Sanders on the issue as the two liberal senators seek to move past their recent feud.

“Bernie Sanders and I established the ‘Expand Social Security Caucus’ in the Senate,” Warren said in a quick interview as she hopped into her car outside a candidate forum in Iowa. “As a senator, Joe Biden had a very different position on Social Security, and I think everyone's records on Social Security are important in this election.”

Warren’s comments come as Sanders has been relentlessly bashing Biden for his past openness to freezing cost-of-living spikes or raising the retirement age as part of larger bipartisan deals — proposals that Sanders opposed during his time in Congress. Warren linking arms with Sanders on the issue also comes after long-simmering tensions between the two exploded into the open this week.
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The campaigns have been trying to move on from the conflict — which climaxed Tuesday night when each accused the other of calling them a “liar” on the stage immediately following the debate —and are largely not responding to media questions about the rift. The Social Security issue provides a potential opportunity for a liberal tag-team against Biden as both senators have long fought to expand the program and have rolled out plans on the campaign trail.