Difficult to categorize is Andy Kaufman's Foreign Man character, who didn't understand comedy but was so enthusiastically inept that one couldn't help but feel bad for him. Anyway, his catchphrase was "Tannk You Veddy Much."
"The nation wants to know!" — Arnab Goswami
Barack Obama's "YES! We can!" It has also been used by several other democratic campaigns over the years. There is also the Spanish version (Sí se puede!).
Bruce Forsyth has a lot which all started on specific TV shows but which he then seemed to carry into everything else he ever did. Most famous are "Nice to see you, to see you... [Invites audience to say 'Nice']" and "Didn't he do well?". In recent times he has also adopted "I am not doddery, doddery I am... [Invites audience to say 'Not']" as a sort of self-parody.
"My Lords, pray be seated." and "My Lords, and members of the House of Commons..." if you're counting the multiple State Openings of Parliament.
And "Have you come far?", which is her all-purpose icebreaker.
Let's not forget "And what do you do?", which is an endless source of comedy for British comedians.
J.G. Quintel tends to say "Yay-yuh!", "Hmm Hmm!" and "OOOHHH!!"
Joe Elliott says "Don't forget us, and we won't forget you" at the end of every live gig.
John McCain's "My friends..."
"The people united will never be defeated!", Juan Peron
"My vote is not positive", Julio Cobos
Keith Olbermann's news cast is awash with catchphrases, from the opener ("Which of these stories will you be talking about tomorrow?") to the signoff ("That's Countdown for this the xxxxth day since the previous President declared 'Mission Accomplished' in Iraq. Good night, and good luck"), the last in Homage to Edward R. Murrow. In between there is "Worst Person in the woooorrrllld!!!" (which is another homage, in this case to Bob & Ray).
It shouldn't be possible for "Sir" to be a catchphrase, but somehow...
Kevin Meaney has "That's not right!".
"Thank you for your very amusing review. After reading it, in fact, my brother George and I cried all the way to the bank." - Liberace
Lloyd Robertson of CTV ended his lead anchoring days [1984-2011] with "And that's the kind of day it's been".
P.T. Barnum's catchphrase was often said to be "There's a sucker born every minute" when it was really "There's a customer born every minute".
Reggie Fils-Aime, president of Nintendo of America, seems to as of lately have made his memetic line "My body is ready" (originally said once during Nintendo's 2007 E3 presentation, and not mentioned again until 2012) into hisown catchphrase of sorts.
Ringo Starr, in keeping with his New-Age Retro Hippie image, signs on with the phrase "Peace and love, peace and love." This became especially hilarious when he put up his much-derided video update telling the world not to send him any more fanmail: "I'm warning you with peace and love."
Robert Caro's The Years of Lyndon Johnson has two that are used as themes throughout the books. The first, said by Lyndon himself is, "If you take care of everything -everything- you'll win." The second, said by one of Lyndon's childhood friends is, "He just had to win. Had to!"
Rodney Dangerfield: "I get no respect, no respect at all." As subverted in an episode of The Simpsons that he guest starred in.
Satoru Iwata always says "Directly to you" in his Nintendo Directs. (Though other Nintendo Direct hosts say this too) as well as "Please understand" when explaining something.
Marvel Comic publisher Stan Lee: "Excelsior!" (This is the also the New York State motto.) Also calling his fans "True Believers".
Thomas Babington Macaulay (who was very intelligent) was wont when he was a child to refer to some item of knowledge as "what every schoolboy knows".
Tucker Carlson: "The show that is the sworn enemy of lying, pomposity, smugness, and groupthink." Carlson used to say this at the beginning and end of his show, but later changed it to only the ending. A guest house will also close out the show with the same phrase.
Walter Cronkite [CBS Evening News, 1962 - 1981] ended almost every broadcast with "...And that's the way it is". He even carried it over to when he voiced a character in We're Back: A Dinosaur's Story.
Parodied in Bruce Almighty with "...and that's the way the cookie crumbles."
And that's the way, uh-huh uh-huh, I like it, uh huh, uh huh.
The great radio broadcaster Walter Winchell (1897-1972) began every radio broadcast with "Good evening Mr. and Mrs. America from border to border and coast to coast and all the ships at sea. Let's go to press." He would then proceed to talk at 197 words PER MINUTE.
"AUSSIE AUSSIE AUSSIE!"
OI! OI! OI! (Interestingly, a Catchphraseis mentioned on this page, but it has nothing to do with that little bit of responsive cheering.)
Chick-fil-a (a fast-food restaurant that specializes in chicken and is closed on Sundays) employees are required to say "My pleasure" any time a customer says "Thank you."
The newsgroup comp.sys.sinclair has many Catch Phrases amongst long-term regulars. From The Fast Show they nicked borrowed "I'll get my coat" (usually rendered as "IGMC") as a way to abruptly end a post. An even more abrupt (and usually euphemistic) ending is [NO CARRIER] or some variant. Then there's replying to "name this game" requests with "it's definitely not Stonkers", and responding to sundry remarks with "you said that yesterday"... The list goes on.
"God Bless America" was a popular speech closer among U.S. politicians. It's dropped off in popularity over the past several years, though.
Sierra Boggess apparently tries to work "You are enough, you are so enough, it's unbelievable how enough you are." in everything.
Hillary Clinton has "...his or her God-given potential" and "do all the good you can." And she usually ends her speeches with "...thank you and God bless you" (occasionally adding "God bless America").
Theresa May: "Strong and stable leadership" (sometimes "in the national interest").
Owen Wilson has a lot of these which he throws in for every movie he appears in. To name a few: