Cruz, speaking at Liberty University in Virginia, repeatedly called on his audience to "imagine" a better, more conservative world.
"Imagine a simple flat tax that lets every American fill out his or her taxes on a postcard. Imagine abolishing the IRS," Cruz said at one point.
Democrats, reporters, and other observers repeatedly made fun of Cruz on Twitter his "imagine" refrain. But, in a clip flagged by Bloomberg News, Public Radio International's "The Takeaway" show took their Cruz teasing a step further and produced a full mashup of Cruz's speech and Lennon's tune.
Listen to it below.