Sen. Elizabeth Warren is hitting the campaign trail with presumptive Democratic presidential nominee Hillary Clinton.  

It’s anyone’s guess whether next Monday’s trip to Cincinnati in the battleground state of Ohio will be a vice presidential audition, but the public appearance alongside Clinton will be the biggest signal yet of the effort to unify the Democratic Party.  

Warren, a Democrat from Massachusetts and a favorite of the liberal wing of the party, has been an aggressive attack dog against presumptive GOP nominee Donald Trump.  

She’s also energized liberals and offers red meat policy positions on the stump.  

Get breaking news alerts and more from Roll Call on your iPhone or your Android.