Liberal Democrats Marshall had a longstanding involvement with Britain's
Liberal Democrats party. He was a research assistant to
Charles Kennedy, former leader of the Liberal Democrats in 1985 and stood for Parliament for the
SDP–Liberal Alliance in
Fulham in 1987. He has made appearances on current affairs programmes such as BBC Radio 4's
Any Questions?. In 2004, Marshall co-edited
The Orange Book with
David Laws. Chapters were written by various upcoming Liberal Democrat politicians including
Nick Clegg,
Chris Huhne,
Vince Cable,
Ed Davey and
Susan Kramer (neither Clegg, Huhne nor Kramer were MPs at the time). Laws, describing the pair's ambition in publishing
The Orange Book, wrote "We were proud of the liberal philosophical heritage of our party. But we both felt that this philosophical grounding was in danger of being neglected in favour of no more than 'a philosophy of good intentions, bobbing about unanchored in the muddled middle of British politics'" The book attracted initial controversy when launched, but both it and the term Orange Bookers to describe those sympathetic to its outlook continue to be frequently referenced to describe a strand of thought within the Liberal Democrats. In 2005, Marshall gave £1 million to the Liberal Democrat-aligned think tank
Centre for Reform. Between 2002 and 2015, he donated £200,000 to the party itself. In 2007, Marshall paid for a campaigner for
Nick Clegg's ultimately successful
leadership campaign. By 2021, he described Clegg as among those who are "progressives" and "not traditional liberals in any understanding of the term". Over the course of the coalition government, Marshall became an ally of education secretary
Michael Gove and grew more favourable to the Conservative Party. He gave a donation of £100,000 to the Leave campaign. Marshall donated £3,250 to Michael Gove's
Conservative Party leadership campaign in July 2016, and in 2019 gave £500,000 to the Conservative Party. Between 2020 and 2023, Marshall gave £890,000 to the conservative think tank
Policy Exchange.
Right-wing media ownership , London, 2025 In 2017, Marshall gave funding to the political news website
UnHerd. Following the resignation of
Andrew Neil in September 2021, Marshall temporarily replaced him as chairman, before being succeeded by Alan McCormick in April 2022. GB News made losses of £30.7 million in 2021–22, £42.4 million in 2022–23, and £33.4 million in 2023–24. Marshall and its other owners have provided the company with further funding to cover its consistent losses, Until 2025 he was its only known donor. In September 2024, Marshall bought
The Spectator magazine for £100 million, more than double the £40m valuation given by media analysts, His takeover prompted Andrew Neil to resign immediately as chairman, having previously said that hedge fund managers should not own newspapers due to potential conflicts of interest. Long-standing Marshall ally
Michael Gove was appointed editor, replacing
Fraser Nelson. Nic Newman of the
Reuters Institute for the Study of Journalism had previously said in June 2024 that Marshall's media acquisitions highlighted "concern that news media are increasingly being viewed as a way to buy political influence". Matt Walsh, head of the journalism school at
Cardiff University, noted in 2025 that while Murdoch used his media to build wealth, Marshall was already wealthy before his media acquisitions, and uses his mostly loss-making outlets for political influence. In May 2025, Marshall called for the
BBC to be sold or broken up, calling it "an embodiment of anti-competitive market distortion" and "the propaganda arm of the state". A BBC spokesperson responded that the BBC is the most trusted news provider in the UK,
Engagement with far-right Twitter content In February 2024 the advocacy group
Hope not Hate called attention to Marshall's activity on his private Twitter account, on which he had almost 5,000 followers, including MPs and journalists. which called for "mass expulsions" of immigrants, which contained
climate denialism (claiming there is "no definitive scientific proof" that
CO2 emissions cause
global warming), and which predicted civil war "once the Muslims get to 15–20%". One of his own tweets, referring to an interfaith ceremony conducted in a French church, said that the Christian church "has its useful idiots".
Alan Rusbridger, former editor of
The Guardian, said these "hateful 'likes' make him unfit to be a media mogul".
Ark Schools defended him in a statement after he was criticised by local
Labour MP
Sam Tarry, though he later resigned as chair and trustee of Ark Schools (remaining a trustee of Ark Charity). A spokesperson for Marshall responded that "This sample [of tweets] does not represent his views". Every tweet and almost 300 likes were subsequently removed from his Twitter account.
Premier Christianity magazine quoted a friend who said that Marshall is "very repentant". ==Philanthropy==