Doctors need to be preserved, not reserved. — slogan used by medical students, doctors, and lawyers in India when they protested in New Delhi against the raised quotas for lower-caste students medical colleges from 22.5 to 49.5 %. 
Had enough? — this was the 1946 slogan for Congressional elections for the out-of-power Republican Party; noting that they had been out of power in Congress since 1930, this slogan asked voters if they had "had enough" of the Democrats.
Hasta la victoria siempre (There's always a victory to be achieved) — a Che Guevara-associated Communist slogan.
Heim ins Reich (Back home into the Reich), describing the Adolf Hitler's initiative to include all areas with ethnic Germans into the German Reich (Austria, Sudetenland, Danzig,...) that led to World War II.
Hey, Hey, LBJ, how many kids you kill today? — Anti-Vietnam War and anti-Lyndon B. Johnson slogan from the 1960s. Other variations included, ".. . how many boys did you kill today?"
Jedem das Seine — Literally, the slogan means "to each his own" and was the German translation of Prussia's motto which read in Latin: "suum cuique". The meaning at that time was "justice for everyone". Used 1937-45 by Nazi Germany over the main gate at Buchenwald concentration camp it figuratively meant "everyone gets what he deserves". The slogan was already used in ancient Roman times by Cicero and Cato.
Labour is not Working — 1978 Conservative Party poster devised by Saatchi and Saatchi. The poster showed a long queue outside a 'Labour Exchange' commenting on the high levels of unemployment.
Never had it so good — 1957 campaign under Harold Macmillan's leadership of the Tories.
Never been had so good — 1957 campaign slogan of the British Labour Party (in response to the Tory slogan).
New Labour, New Danger — slogan on 1997 Conservative Party campaign poster showing Tony Blair with glowing red eyes. The campaign backfired as the poster was criticised for implying that Blair, a stated Christian, was demonic and then the Conservative Party's failure to state who had authorised the poster.
Save the Bay — Chesapeake Bay Foundation slogan to save the Chesapeake Bay.
Simon Go Back — Against the Simon Commission: The Indian Statutory Commission was a group of seven British Members of Parliament that had been dispatched to India in 1927 to study constitutional reform in that colony. It was commonly referred to as the Simon Commission after its chairman, Sir John Simon. Ironically, one of its members was Clement Attlee', who subsequently became the British Prime Minister who would oversee the granting of independence to India and Pakistan in 1947.
Stay the course — a slogan popularized by the Bush administration as the strategy for the Iraq War
Tyler and Texas! — John Tyler's slogan for supporting the annexation of Texas.
¡Una, Grande y Libre! — "One, Great and Free!", a Francoist slogan from Spain. It expressed three nationalist concepts; One) indivisible, against regional separatism, Great) in recognition of its imperial past and advocation of future expansion in Africa, Free) not submitted to internationalist foreign influences, which was a reference to what Francoists claimed was a "Judeo-Masonic-International Communist conspiracy" against Spain.
Wir sind das Volk (We are the people), motto of the "Monday demonstrations" that led to the demise of the East German State and its inclusion into the West German one.
Don't swap horses in midstream — 1864 U.S. presidential campaign slogan of Abraham Lincoln. Also used by George W. Bush, with detractors parodying it as "Don't change horsemen in mid-apocalypse." The slogan was also used for comic effect in the film Wag the Dog.
This is a White Man's Government! — Horatio Seymour 1868 Democratic Presidential Candidate
Ma, Ma where's my Pa? — 1884 U.S. presidential slogan used by the James Blaine supporters against his opponent Grover Cleveland, the slogan referred to fact Cleveland had fathered an illegitimate child in 1874. When Cleveland was elected President, his supporters added the line, "Gone to the White House, Ha, Ha, Ha!"