OAKLAND -- Time will tell if Port of Oakland Commissioner Bryan Parker proves to be a formidable mayoral candidate, but he's already shown himself to be a potent fundraiser.

Parker, a 44-year-old with an eye-catching résumé but no political experience, collected roughly one-third more campaign cash than Mayor Jean Quan during the first half of the year, according to reports filed Tuesday with the City Clerk.

Parker raised $98,975 compared to Quan's $66,458. A third candidate, San Francisco State professor Joe Tuman jumped into the race this month, after the reporting period for campaign donations had already ended.

With Oakland's mayoral election still more than a year away, it's important for a political unknown such as Parker to show potential supporters that he can compete for cash with the incumbent mayor.

"I think the fact that I out-raised her by $30,000 speaks to the fact that there is a broad swath of residents in this city that are ... excited for someone with a proven ability to competently manage a city of this size," he said.

Quan's reelection campaign co-chairman Michael Colbruno said the mayor was busy running the city and that once she begins seriously fundraising she won't have a problem hitting the city's nearly $400,000 campaign spending limit.

Parker said he received the contributions over six weeks and that a little more than half the money came through an online fundraising site.

His best-known contributor was former Oakland Raiders President Amy Trask, who gave him $250. Parker, a former vice president at DaVita Inc. who graduated from UC Berkeley and New York University Law School, said he had developed strong funding networks both inside and outside the Bay Area and had no doubt that he too would reach the spending limit.

Quan raised a greater percentage of her money from Oakland. She also received money from several unions.