CONCORD, N.H. (AP) -- The pressure is building on Democratic Senator Barack Obama to run for president in 2008.

This week, fellow Illinois Senator Dick Durbin sent a letter to political supporters encouraging them to sign a "Run, Barack, Run" petition.

Another effort to get Obama to run has surfaced online. Democrat Todd Webster has created a Web site that he says attracted hundreds of Obama supporters within days, signing a petition urging Obama to run.

Another online effort that began in October was revamped this week. A statement says a computer technician created the site after he saw Obama's keynote speech at the Democratic National Convention in 2004.

Obama is in his first Senate term, but he has gathered national attention for his fresh face, commanding speaking style and compelling personal story.

He'll be visiting New Hampshire next month, his first visit to the key early primary state.