Require all MPs to cycle everywhere, or take public transport, even the prime minister.
This would fix politics in a number of ways.
As we all know, cycling makes you cleverer because of the increased blood flow to your brain.
It also makes you less miserable – hard to be unhappy when riding a bike, even (especially?) in the rain. A happy politician is a good politician as my old grandad used to say.
And travelling on public transport would mean our politicians meet the people they make decisions for on a daily basis, rather than only when out campaigning.