One mark against Sen. Rob PortmanRobert (Rob) Jones PortmanHillicon Valley: Democrats introduce bill to hold platforms accountable for misinformation during health crises | Website outages hit Olympics, Amazon and major banks Senators introduce bipartisan bill to secure critical groups against hackers Democrats pushing for changes to bipartisan infrastructure deal MORE (R-Ohio) being Mitt Romney’s vice-presidential choice may be that Portman’s not sufficiently polarized.

If the speculation that Portman will become Mitt Romney’s vice-presidential pick proves true, he could complicate the presidential race in an unexpected way: He has a legitimate record of bipartisanship and is well-regarded even by a number of Democrats on Capitol Hill.

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Portman is currently stirring more vice-presidential talk among Beltway insiders by taking a trip to Israel, where he held a meeting with Prime Minister Benjamin Netanyahu on Thursday.

The Ohioan has faced criticism for his supposed grayness, but he pushed back against that during an interview with CNN immediately following the Netanyahu meeting.

Asked by anchor Gloria Borger whether a perceived lack of “pizzazz” would hinder him, Portman responded:

“I think what people are looking for right now is not the kind of pizzazz and pop that perhaps we thought we got in 2008 — certainly President Obama offered that. What they want now is someone who can work closely with Congress and get things done. We have a paralysis in Washington.”

Should Portman get the nod from Romney, President Obama's team will undoubtedly focus on his work for the administration of President George W. Bush. He served as U.S. Trade Representative and, later, director of the Office of Management and Budget (OMB) during Bush’s second term. He served a little over a year in each position.

But his service during the Bush years, and his conservative positions on social issues (he backed a constitutional amendment to ban same-sex marriage, for example), might not displace the broader sense that he is more willing than most to reach out for common ground.

When he left the OMB, and the Bush administration, in 2007, then-House Majority Leader Steny Hoyer (D-Md.) called him “one of the finest public servants with whom I have served in the House” and praised his “willingness to work with members on both sides of the aisle.”

Sen. Kent Conrad (D-N.D.) called him “a person of credibility and decency.”

The liking for Portman goes beyond pro-forma warm words. His close and constructive relationship with Sen. Ben CardinBenjamin (Ben) Louis CardinDemocrats pushing for changes to bipartisan infrastructure deal The Hill's Morning Report - 2024 GOPers goal: Tread carefully, don't upset Trump Bipartisan spending deal meets fresh resistance from key Democrats MORE (D-Md.) dates back more than a decade to when, as House members, they worked together on legislation that they said would have simplified and strengthened the pension system.

He is said to be friendly on a social basis with Sen. Mark UdallMark Emery UdallKennedy apologizes for calling Haaland a 'whack job' OVERNIGHT ENERGY: Haaland courts moderates during tense confirmation hearing | GOP's Westerman looks to take on Democrats on climate change | White House urges passage of House public lands package Udalls: Haaland criticism motivated 'by something other than her record' MORE (D-Colo.), the two men having apparently bonded over their love of outdoor activities. Portman, a keen kayaker, is even reputed to practice his rolls in the congressional swimming pool.

Running for election to the Senate in 2010, Portman saw the benefits of highlighting his bipartisanship. During a debate with his Democratic opponent, Lee Fisher, Portman stated: “I often joke in front of Republican crowds, and probably people are [made] a little nervous by the fact, that 12 of my bills were signed by President Clinton.”

An investigation by Politifact found the claim “mostly true,” saying that while “it depends on how you count the bills," the claim was “more or less” accurate.

Among the more intriguing partnerships Portman forged was with the late Rep. Stephanie Tubbs Jones (D-Ohio), with whom he sponsored a bill to guarantee federal funding for the National Underground Railroad Freedom Center in Cincinnati. Tubbs Jones once said of him: “Compared to other Republicans, [he] is pleasant and good to work with.”

During his time in the Senate, Portman has worked with Sen. Mark PryorMark Lunsford PryorBottom line Everybody wants Joe Manchin Cotton glides to reelection in Arkansas MORE (D-Ark.) on regulatory issues, Sen. Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenPoll: Potential Sununu-Hassan matchup in N.H. a dead heat  Transit funding, broadband holding up infrastructure deal Bipartisan group says it's still on track after setback on Senate floor MORE (D-N.H.) on energy efficiency and Sen. Ron WydenRonald (Ron) Lee WydenOn The Money: Senate braces for nasty debt ceiling fight | Democrats pushing for changes to bipartisan deal | Housing prices hit new high in June Top Democrat presses IRS for improvements to web tool on child tax credit Democrat stalls Biden's border nominee MORE (D-Ore.) on seniors’ health.

Still, if personal liking for Portman is in relatively abundant supply, some Democrats caution that this should not be mistaken for ideological centrism.

“He is very likable, a gentleman, but he is far more conservative than the demeanor would indicate,” Rep. Richard Neal (D-Mass.) told The Hill. “He’s not acerbic, that’s for sure. But he’s very conservative.”

But Republican Rep. Kevin BradyKevin Patrick BradyTop Democrat offers bill to overhaul tax break for business owners What you need to know about the new monthly child tax credit payments On The Money: Biden fires head of Social Security Administration | IRS scandals haunt Biden push for more funding MORE (Texas), who served alongside Portman on the House Ways and Means Committee, spoke up for his friend’s willingness to compromise. Calling himself a “big fan of Rob Portman’s," Brady said he “did work with Dems on saving issues, especially.”

Susan Schwab, who succeeded Portman as U.S. Trade Representative, also weighed in emphatically on his side, lambasting reporters “who write about him as a boring white guy, and who obviously have never met him or worked with him.”

Schwab added that anyone seeking to demonize Portman would face a difficult task.

“It would be hard to caricature him, because he’s not a caricature,” she said. “There is a tendency in politics now to present people as two-dimensional all the time. But he’s got such a proven record that you couldn’t make him seem two-dimensional. You couldn’t get away with that with Rob Portman.”