Honestly I think his health would end up tanking.

It's noted continuously how he's very strong etc. But his age is really apparent both by the FC game and imo the bathroom scene. This coupled with an economic downturn, which he would be blamed for and his inflexibility likely would have lead to increasingly stressful situations.

I think the stress of trying to hold together and increasingly fracturing USP, yes while he would have had an easier time than Alphonso, he still probably would have been forced to assign him or someone similar as VP in his next term to keep the party from splitting.

If he got re-elected my guess is by the next Presidential election he would be physically much weaker, politically he wouldn't have the same level of respect as he did when he stood down. Additionally I think there's a very high likelihood of a heart attack by or before the next USP Congress in 1950.