Bikers for Obama are anything but recycled campaigners.

Take Wilbert "Pops" Williams, who at age 70 is campaigning for a presidential candidate for the first time. Sen. Barack Obama of Illinois is his man.

"Obama is really more for the people than anyone. I've never been this excited about a candidate," said Mr. Williams, of Homewood, one of about 200 bikers who gathered in Highland Park yesterday, then rode in unison through the metro area to show support for Mr. Obama.

On the final weekend before the Pennsylvania primary election, thousands of other people took to the streets to help Mr. Obama and Sen. Hillary Rodham Clinton of New York, the other Democrat contending for the presidential nomination.

Some of the most committed campaigners traveled hundreds of miles and spent hundreds of dollars on gasoline.

Alicia Barker-Aguilar and her mother, Paxson Barker, who are from Washington, D.C., and Baltimore, made their first trip to Pittsburgh to knock on doors for Mrs. Clinton.

"I love her vision. She understands what the average person needs," said Ms. Barker, 59, a nurse for 35 years who now is studying for a doctorate in her profession.

Ms. Barker-Aguilar, 26, said she works for a member of the U.S. House of Representatives. She used her weekend to tout Mrs. Clinton's tenacity to Pittsburgh voters.

"I know she's not willing to back down on the issues that are important to me," Ms. Barker-Aguilar said. "We're fighting two wars. We're facing recession. Gas prices are soaring."

Though most campaigners were ordinary people, one was so famous that news crews followed her.

Kansas Gov. Kathleen Sebelius caused a buzz yesterday when she walked into a Regent Square breakfast spot to stump for Mr. Obama.

A week before voters in her state gave Mr. Obama 70 percent of the caucus votes on Super Tuesday, Ms. Sebelius, threw her support behind the Illinois senator. She credited her sons, ages 23 and 26, for urging her to take a stand for Mr. Obama.

"A lot of their friends have been fired up and inspired by politics for the first time in their lives. We were in danger of losing a generation of voters. Now folks are registering in record numbers," Ms. Sebelius said during the campaign stop at the Square Cafe.

Cheryl Leibowitz, 18, home from Brandeis University, joined her father, Marvin, in Market Square to campaign for Mrs. Clinton.

She said she prefers Mrs. Clinton's plan for universal health-care coverage, and she has "an objection" to Mr. Obama's main campaign theme. Ms. Leibowitz said his pledge to create change in Washington is empty.

"He's a senator in his first term. I don't like the rhetoric," she said.

Marvin Leibowitz, 58, a lawyer from Squirrel Hill, was more measured in assessing the candidates. He said he favors Mrs. Clinton, giving her the edge in experience and for having a better health-care plan.

But he also is a loyal Democrat who serves the Allegheny County and state Democratic committees. If Mr. Obama wins the nomination, Mr. Leibowitz said, he would support him in the November election.

Among Bikers for Obama, several said they were annoyed by Mrs. Clinton's tactics. Ivy Jones, 37, of McKeesport, was one of them.

"I feel like her true colors came through when she was losing ground in the polls. She started to do whatever it takes to get votes," Mrs. Jones said.

Mrs. Jones said she has always voted, but not until Mr. Obama came along was she inspired to campaign for a candidate.

Her husband, Rodney "Little Dude" Jones, said Mr. Obama won him over by being tough-minded but respectful.

"He's got the caring attitude. He's not dealing with all that campaign dirt," said Mr. Jones, 31.

Ms. Barker said the trip to Pittsburgh with her daughter will be a good memory. She said she found voters receptive to her message that Mrs. Clinton is the superior candidate.

"She's logical. She's strong. She's the one for me."