Wikiquote files this under Misattributed ↗ for Thatcher and identifies it as an adapted Lyndon Johnson quote: “If one morning I walked on top of the water across the Potomac River, the headline that afternoon would read: ‘President Can’t Swim.’” Be aware of the limit of that finding: we could not reach the newspaper article Wikiquote names as the source of the Thatcher attribution, and we found no primary source — no transcript, no contemporary report — for the Johnson original either. The one thing well supported here is the negative: this is not a documented Thatcher line.
“If my critics saw me walking over the River Thames they would say it was because I couldn't swim” If one morning I walked on top of the water across the Potomac River, the headline that afternoon would read: "President Can’t Swim." —attributed to Lyndon B. Johnson; the Thames version credited to Margaret Thatcher is an adaptation
⚠ The slide-ready mistake: crediting this to Margaret Thatcher. Use the credit shown above instead.
Can you use it?
? We couldn’t establish where this was first published, so there’s no rights status to give. Credit it as shown above — just don’t present it as public domain, and get permission for commercial or published reuse.
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In context
Evoking the world of Lyndon B. Johnson — 36th President of the United States. Theme: "If my critics saw me walking over the River Thames they would say it was because I couldn't swim". Atmospheric and restrained, cinematic directional light, a muted period-appropriate palette, fine grain and texture. Compose with generous empty space for the quote and a small credit line. No lettering in the image itself.
Minimalist
Minimalist editorial slide for the quote "If my critics saw me walking over the River Thames they would say it was because I couldn't swim". Clean background, a single muted accent color, generous negative space, subtle paper or linen texture, no literal illustration — let the words carry it. Reserve clear space for a serif quote and a small credit line. No lettering in the image itself.
Provenance
The line it was adapted from
Attributed to
Lyndon B. Johnson, 36th President of the United States
Original river
The Potomac, not the Thames
Documented by
Wikiquote’s Misattributed section for Margaret Thatcher
Primary source
None located
If one morning I walked on top of the water across the Potomac River, the headline that afternoon would read: ‘President Can’t Swim.’
This is the wording Wikiquote gives for the Johnson original. We reproduce it as Wikiquote states it; we were not able to confirm it against a speech text, press-conference transcript or contemporary newspaper report.
Wikiquote ↗ states that the Thames version is “actually an adapted Lyndon Johnson quote” and prints the Potomac wording in full. That is the anchor for this page.
The Daily Telegraph feature Wikiquote cites as the source of the Thatcher attribution is on a host this run could not reach, so we cannot say what it claims beyond Wikiquote’s summary of it.
We searched Quote Investigator for the Potomac wording and for “President Can’t Swim” and found no investigation of either — the specialists have not traced this one, so there is no earlier or firmer finding for us to defer to.
Searches for the Johnson original returned only quotation-aggregator sites, which repeat each other and cite nothing. We have therefore not asserted a date, occasion or publication for it, and this page claims none.
We could not identify the work in which either version was first published, so we assert no rights status. If the Johnson line is genuine it would date from the 1960s and be well inside copyright; that is a reasonable inference, not a verified fact, and we have not built anything on it.
Rights status is our research, not legal advice — and copyright varies by country and edition. For commercial or published use, confirm with the rightsholder. See terms.
Fact-check
Often misattributed
A stock political joke about walking on water, relocated from Washington to Westminster.
✕
Popularly credited toMargaret Thatcher No primary source
Wikiquote ↗ places the line in its Misattributed section, notes the attribution comes via a newspaper feature and “other sources,” and identifies the real ancestor as a Lyndon Johnson line about the Potomac.
✓The shape of the joke — walk on water, get a hostile headline — belongs to Lyndon Johnson ↗ and the Potomac. Whether Thatcher ever repeated it about the Thames is undocumented; whether Johnson ever said it is, on the evidence we could reach, also undocumented.
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Filed under
More provenance-checked quotes on the same theme, each with its reuse status.
Lyndon Baines Johnson (1908–1973) was the 36th President of the United States, taking office on the assassination of John F. Kennedy in 1963. He had a long and combative relationship with the Washington press corps, which is the soil this particular joke grows in — though we could not find a primary record of him telling it.
For writers & researchers
Cite this
The primary source (Chicago)
No primary source located for either wording. Earliest documented statement available to us: “Margaret Thatcher: Misattributed,” Wikiquote, which identifies the Thames version as an adaptation of a Lyndon Johnson line about walking across the Potomac.
This verification page
Quotle.info. “Who really said ‘If my critics saw me walking over the River Thames they would say it was because I couldn't swim’?” Last verified 19 Aug 2026. https://quotle.info/who-said/if-my-critics-saw-me-walking-over-the-river-thames-they/