SEATTLE – There's the possibility that by Tuesday night, one or both major political parties could know who their presidential nominee will be.

But if not, the stage will then turn to Saturday's Washington caucuses.

At Sen. Barack Obama's office in Seattle's Pioneer Square, the campaign has flown in staff from other caucus states like Iowa and Nevada.  It's all about which campaign can get the most people to the Washington caucus.

"We're calling, phone-banking, likely caucus-goers every night, making 5,000 phone calls a night statewide," said Obama campaign spokesperson Jeff Giertz.

Meanwhile, the Sen. Hillary Clinton campaign has been holding training sessions in western Washington, getting supporters ready, not just to attend, but to speak up for their candidate in a caucus environment.

Democrats will pick all their elected delegates based on the caucus results, but Republicans will consider both the caucus and the state primary on February 19.  Republican candidates Mitt Romney, Mike Huckabee and Ron Paul will benefit from a caucus which usually brings out the most loyal party members.

What might that mean for Sen. John McCain, who draws much of his support from independents and moderates?  His Washington state campaign is all volunteer.

"We're identifying people who've attended caucuses in the past and people who we think will attend the caucus this time around.  We're touching them by email and phones and mail," said Chris Fidler, a McCain supporter.

A new KING 5 News poll finds 32 percent of Romney supporters plan to caucus.  17 percent of McCain supporters will be there and 12 percent of Huckabee supporters plan to go.  On the Democrat side, 31 percent of Obama supporters plan to attend compared to 26 percent from the Clinton side.

That's not an indication of who is going to win, but it does show who is the most motivated to attend a caucus.

On the Democrat side, 31 percent of Obama supporters plan to attend compared to 26 percent from the Clinton side.

Those numbers may change by Tuesday night, after the results of Super Tuesday reveal more about whether the races are heating up or if one candidate takes a commanding lead.