Question

How did walter Cronkite's proclamation that the Vietnam war was unwinnable affect politics?

Answer 1

His proclamation changed the minds of many Americans who supported the war in Vietnam which caused many politicians to change their views on the war as well. A famous example would be Lyndon B. Johnson who decided not to run for another mandate.

Answer 2

President Lyndon B. Johnson backed out of the race for reelection.