While Tuesday's first Democratic presidential debate will probably lack the name calling and sharp jabs of the Republican faceoffs, there's still potential for strong disagreements between the party's leading contenders.
On the trail, Hillary Clinton and Bernie Sanders shy away from direct mentions of each other, focusing instead on the Republicans.
But on Tuesday it will be hard to escape the fact that they have had very different approaches to major issues.
Former Maryland Gov. Martin O'Malley has been introducing himself to voters for months, but he still is almost nowhere in the polls. The debate could be his chance to grab the kind of attention that could get his candidacy off the ground.
Joining O'Malley at the bottom of the field are former Virginia Sen. Jim Webb and former Rhode Island Gov. Lincoln Chafee.
And then there's Joe Biden, the man who could throw a wrench in the whole thing — if he decides to run.
The event in Las Vegas, hosted by CNN, is one of four Democratic debates scheduled.
Meet the candidates