Churchill College — part of Cambridge University and named after Sir Winston — has as its motto:
It has been the college’s motto since it was established in 1958. The college took it from the final phrase of Churchill’s famous first speech to the House of Commons as Prime Minister in 1940, his “Blood, Toil, Tears, and Sweat” speech, in which he said “Come, then, let us go forward together.”
Addn: As a commenter pointed out,”Forward” is also the state motto of Wisconsin.
So maybe the president was just trying to secure those Electoral College votes.
Katy Perry definitely profited from the slogan.
As you can see below, conservatives were all over Forward.