I’ve seen this chart before, but why don’t you see someone with Rick Santorum’s social views and Bernie’s economics in real life or run for office? Fiscally left/socially right may be the future winning ticket. Populist parties in Europe are trending this way already.
Part of this is the difference between the average profile of people likely to make serious runs at public office (much more likely to be college-educated, white and metropolitan) and the profile of the median voter. Another plank is institutional conventional wisdom lagging behind current political norms - a couple of decades ago, Reaganomics was a lot more popular. These two are somewhat related in that institutions that form said conventional wisdom (most of the press etc.) also come from these backgrounds in which socially liberal, economically conservative people are a lot more prevalent (think NYT, WSJ, etc.).
I believe the main reason why you won't see it very often in presidential candidacies is because most institutionalists despise the economic component and do their best to tie it to more divisive social policy. Sanders' more populist 2016 campaign was disingenuously decried as racist and tied to Republicans (where his 2020 campaign moved from this, the same people claimed it was suddenly "Unelectable"). Any Republican equivalent's would be tied to "America-hating socialists" (probably with reference to AOC) - we've already seen this begin with the Republican hit pieces on Hawley. Reasonable compromiseTM for Republicans will almost always be on social issues and, for Democrats, usually on economic issues - the opposite of where each party has most room to grow with the general populace. The more politics is focused on the culture war, the less likely it is that its most corrupt operatives will be called to account.
Tucker seems to be setting himself up for a run based on that quadrant. It seems pretty likely that his charisma and popularity with the base will let him get through the primary if Trump loses, and a Tucker-Kamala election could be pretty brutal for Dems.
