Democratic Presidential candidate Barack Obama made his first visit to Portland over the week. The visit was a success for the campaign, which raised $400,000 from the appearance.

Meanwhile, Nielsen measurements show Obama is number one on the web among candidates.

Among the interesting findings: Dem's trumped Republicans in terms of visitor traffic and time spent on their Web sites, according to new Nielsen//NetRatings data for July.

Republicans topped Dem's for online advertising spending. Repub spending on sponsored links grabbed more than double the impressions of the leading Democrats.

Sen. Barack Obama led both the Democrat and Republican packs when it came to traffic, with some 717,000 unique visitors to BarackObama.com last month. Hillary Clinton and John Edwards took second and third place with 437,000 and 348,000 uniques, respectively. But Hillary was tops for 'user engagement', with the average visitor to her web site spending over 8 minutes at HillaryClinton.com, edging Obama's 7:53 minutes. By comparison, the typical visitor to JohnEdwards.com spent just 3:43 on his site.