There are some who suggest that at the time of his death, Lennon was reconsidering his previous stances, and they’ve even gone so far to suggest that he was a fan of Reagan.
I don't think Lennon was ever the hard-core leftist he was portrayed to be.
"If you go carrying pictures of Chairman Mao,
You ain't going to make it with anyone, anyhow."
I think he was more libertarian and questioned the authority of large government institutions. I also think he was rather naive back in the 1960s. I can see that as he got older and had the chance to step back and reflect on things, he probably saw that he was operating under a number of...misconceptions...about the way the world works. Really, I think his belief structure was rather immature as a Beatle.
It's still a stretch to say he was a fan of Ronald Reagan, though.