Zyobot
Just a time-traveling robot stranded on Earth.
I finished a TL where Dewey actually defeats Truman several months ago, it's in my sig. However, his victory there was a pretty narrow one. Having him win by a bigger margin than he did in my TL wouldn't be too difficult, given Truman's unpopularity going into the election - a combination of Dewey campaigning aggressively even earlier (IOTL a mix of overconfidence and learning the wrong lessons from his 1944 run against FDR led him to run an anemic, substance-free campaign that was drowning in platitudes) and delaying the economic recovery from the post-WW2 recession until after the election's done should make '48 into the proper Republican blowout everyone not named Harry S. Truman initially expected.
I've seen that before and have read some of the corresponding entries, yes. It did, however, get me thinking about what a much more lopsided election would've looked like, given how Dewey only won in the Electoral College (and by the skin of his teeth, at that!). Pair that with OTL Truman's better, but still-modest victory in actual 1948, and it was only a matter of time before someone asked what a landslide for either candidate might look like.
To that end, I'd have heartily suggested having Eisenhower run on the GOP ticket four years early, but have also heard multiple claims about him being wishy-washy until 1952 (courtesy of Douglas MacArthur scaring the daylights out of everyone else). As such, I wonder if convincing him to challenge Truman early and swipe the Republican nomination from a jealous Dewey would be enough? At the very least, I think he'd be able to a) hit Dewey on losing the first time around and b) frame him as a civilian unprepared to face the various martial challenges of the post-war world (Ike would probably emphasize his experience in handling the latter, at least). Of course, even if Ike '48 is too unlikely, having him off against Truman in '52 is practically guaranteed to hand him a landslide on a silver platter (if only after a four-year wait).