Republican presidential candidate Mitt Romney. (M. Spencer Green/Associated Press)

That’s based on the number of lobbyists in those firms who are advising Romney’s campaign, bundling contributions for him, and contributing money to the campaign. First Street compiled data from Federal Election Commission filings and independent research on individual lobbyists who Romney has named campaign advisers. Some highlights:

• Dutko has one lobbyist serving as a campaign adviser, two lobbyists bundling contributions for the campaign, and seven lobbyists contributing to the campaign.

• DLA Piper has two lobbyists bundling contributions and four lobbyists contributing to the campaign.

• Ogilvy has two lobbyists bundling for Romney and three lobbyists contributing to the campaign.

• Podesta has one lobbyist serving as a campaign adviser and four lobbyists contributing to the campaign.

“These firms are positioning themselves for a Romney presidency,” said Alexander Bronstein-Moffly, the report’s author and lead researcher. “They stand to gain the most future access and have stronger relationships with the campaign.”

Representatives at those four firms either declined to comment or could not immediately be reached Monday.

Though it’s been widely noted that 16 lobbyist bundlers have raised more than $2 million for the Romney campaign in 2011, Monday’s report focuses on who among Romney’s campaign staff has ties to the lobbying firms, Bronstein-Moffly said. Ten current and former lobbyists (three are current lobbyists; seven are former lobbyists) are directly affiliated with the Romney campaign as advisers and staffers, the report found. Among the firms they’ve worked for:

• Winston & Strawn

• Baker & Hostetler

• Wiley Rein

• Mayer Brown

• Covington & Burling

• Dutko Worldwide

• Podesta Group

Meanwhile, Rick Santorum appears to be receiving far less backing from lobbyists, the report found. Only two current lobbyists are directly affiliated with his campaign, and he has received 21 contributions from lobbyists — compared to 311 contributions from lobbyists to Romney.