PORTLAND, Ore. -- It's Oregon's turn.

With the Indiana and North Carolina primaries concluding last Tuesday, presidential hopefuls Barack Obama and Hillary Clinton turn their attention toward Oregon Friday and Saturday.

The campaign swings give Oregon's more than 870,000 Democrats their moment in the primary spotlight.

Oregon is one of only a handful of contests remaining, and is perhaps the most competitive of the states that have yet to vote. Also voting on May 20 are Kentucky, South Dakota and Montana.

Most political analysts think Obama has the edge in Oregon, but Clinton increased her visibility in the state in recent weeks.

But political analyst Jim Moore said Tuesday's election results -- a big win for Obama in North Carolina and a narrow Clinton victory in Indiana -- were a major setback for Clinton, and will send her "limping" into Oregon. Moore, a political science professor at Pacific University in Forest Grove, said he was struck by the almost somber tone of Clinton's speech to her supporters Tuesday night.

"After hearing her speech (Tuesday) I will be surprised if she is running a full-out campaign by the time the final ballots are counted in Oregon."

For now, however, both candidates are advertising on television in Oregon, and have volunteers making phone calls, holding house parties and knocking on doors throughout the state.

Obama is expected to be strong in Portland, Eugene and Corvallis, but Clinton could chip away at his edge in the populous suburban counties, along the Oregon Coast and in the southern part of the state.

"(Obama) will convince people to get those last ballots in; he will meet directly with Oregonians to hear their concerns," spokesman Nick Shapiro said.

Voters should expect an aggressive get-out-the-vote effort by both campaigns, since Oregon's unique vote-by-mail system means ballots can be turned in at any point from now until May 20.