I mean that simply not the case for every politician there are plenty of politicians with a deficit in charisma and are skilled in managing interest groups and stakeholders to garner support. People overvalue charisma in politics. Though I will give you the more national the race the higher in importance it becomes.

Edit: For those who doubt why don't you attend your local politics meeting in my case this would be direct democracy townhall I can tell you our selectman would put you to sleep. If you want farther up go check to see your state rep I doubt they're a Casanova. If those are too hard go watch cspan which i do, most of these guys come off as glorified pencil pushing bureaucrats half the time which makes sense as half of them are lawyers truly a profession know for exclusively exciting action packed court cases and not sifting through hundreds of pages of legalises documents that use so much circle logic you don't know where a paragraph begins and ends.

The overwhelming majority, 96%, of Members of the US Congress have a college education.

A degree from a top school or seeming to "academic" is sometimes seemed as negative in some political races. But it seems the american political elite are more highly educated and on average probaly higher than average intelligence.