INDIANAPOLIS -- Democratic presidential hopeful Sen. Barack Obama is planning to visit Indianapolis on Saturday, less than two months before Indiana will hold a primary that could help decide who grabs the party's nomination.

Obama's campaign announced the visit Wednesday but said further details would be released later. Kip Tew, the Obama campaign's Indiana coordinator, said the details still were being decided.

It was not immediately known if Obama would appear at a rally, town hall meeting or fundraiser.

"The schedule is still in flux. The only thing I know for sure is that he's going to be here Saturday," Tew said.

Indiana holds its presidential primary on May 6, and its 72 Democratic delegates could play an important role in determining whether Obama or Hillary Rodham Clinton advance to the general election.

Because many states hold primaries before May, presidential nominations often are wrapped up before Hoosiers get to vote. But this year, Obama and Clinton are locked in a tight race, and it still could be close in May.

According to an Associated Press count, Obama has 1,598 delegates, including separately chosen party and elected officials known as superdelegates. Clinton has 1,487, according to the AP. It takes 2,025 delegates to secure the Democratic nomination for president.

"If you look at what the national prognosticators are saying, they're saying that Indiana is probably one of the last few remaining swing states in this contest," said the state's Democratic Party chairman, Dan Parker. "So (Obama's visit) doesn't shock me."

Parker said he hopes both candidates would visit the state many times.

Joe Hogsett, a Clinton campaign coordinator in Indiana, said Obama's visit is "indicative of the fact that both Sen. Clinton and Sen. Obama are going to pay a lot of attention to Indiana and that Hoosier voters are going to have an opportunity to help pick a president."

With an important Pennsylvania contest six weeks away, Obama is playing down his chances there, even though a victory would effectively finish Clinton. His aides are emphasizing instead the need to campaign in Indiana, North Carolina and other presumably friendlier states that will vote after Pennsylvania.

The Obama campaign expects Indiana to be a battleground because of its large black population and the fact that the northern part of the state is in the Chicago media market, where the Illinois senator is often on TV and in the news. But Indiana also has a significant blue-collar population and Evan Bayh, the state's senator and former governor, will actively campaign for Clinton.

Clinton, a U.S. senator from New York, is banking heavily on Pennsylvania. A solid win here could sustain her claim to late-season momentum and the ability to win big, industrial states.

Obama's last trip to Indianapolis was for a private fundraiser in July.