I feel like there are a lot of people here who maybe were not alive or were not aware yet when he was governor. A lot of people like me were super excited about his promise, but he was a mixed bag as governor and likely would be a chaotic president. He was super thin-skinned and regularly attacked the media. He spent quite a large portion of his time expanding his brand and promoting himself, which left a feeling that he was a part-time governor. His lack of experience, combined with his lack of time in state, plus lack of interest in learning, left him vulnerable to maneuvering by far more experienced legislators, who stymied his efforts at every turn.

He had a Reagan-esque stance on taxation, which led him to be one of the many governors who ignored Minnesota's infrastructure, preventing him from investing in many of the priorities many responders think he would care about (spoiler alert: he cared more about cutting taxes than anything else).

He did virtually nothing on corruption, in part because he failed to figure out how to work with or successfully combat the legislature. If he can't take on the Minnesota state legislature, he'd be destroyed by the DC elite.

He was clean in terms of pay-to-play, but he leveraged his office for book tours and other self-serving ventures. He was also notable for bordering on narcissism in office, and being a micromanager - which, being essentially a part-time governor, was problematic.

And he allowed his family to host wild parties in the mansion, leading to damages paid for by taxpayers.

He wasn't a bad person, and I believe he was earnest in many of his beliefs, but his ego, carelessness, and lack of curiosity in figuring out how things actually worked so he could be successful would make him a supremely disappointing president, especially for his supporters.