I assume we are talking about a platform of solutions that work for the greatest amount of citizens...
A few planks right off the bat:
Legalization of drugs that have about the same or better effect on health as currently legal drugs
A simplified and automated tax system where income over X% of FPL is automatically sent to the government at progressive rates
Infrastructure improvement to create jobs and strengthen the systems we all use
Those three are pretty uncontroversial and can save/redirect a lot of money.
They're also almost impossible to implement - taking each one in turn....
Legalization of drugs that have about the same or better effect on health as currently legal drugs
According to whom ?
The issue of the health impact of currently illegal drugs is already intensely politicised with, for example, some groups who support the legalisation of cannabis providing evidence to show that it is positively beneficial and those on the other side of the debate providing counter evidence showing that it causes all kinds of physical and psychological damage.
Then there's the issue of use vs. abuse. Some substances may be less bad than alcohol or tobacco when all are used in moderation but may be worse when used to excess. It will be a minefield.
I personally agree that legalisation of many currently illegal drugs would likely be beneficial but I cannot necessarily justify that on medical grounds alone.
A simplified and automated tax system where income over X% of FPL is automatically sent to the government at progressive rates
Again, a laudable aim and one which many people could sign up to but this hides a complex real-world problem. As I understand it, the U.S. tax system has a comprehensive and complex set of deductions which allow people to offset income against tax. Presumably these deductions are here for a reason and serve a specific purpose. One solution would be to sweep away these deductions but wouldn't that leave a lot of low and middle income earners a lot worse off ?
Of course there are a lot of very wealthy people who are very good at not having "income" and instead find other ways to pay themselves. This system seems to work in their favour.
Infrastructure improvement to create jobs and strengthen the systems we all use
Another laudable aim but one which will IMO end up being mired in controversy. The first question which will cause uproar is what constitutes infrastructure. There are those who would, for example, say that roads are an important part of national infrastructure requiring investment. Others would say that this is a very regressive view, tying us to the technologies of the past and instead the investment should go into high speed rail or renewables-based transportation solutions.
Then there's the whole issue of pork and/or graft. Which districts get the infrastructure investment and which companies get to deliver it. On one hand it would be nice if small local companies shared in the bounty but they are likely more expensive and/or more risky than huge corporations who, with their lobbyists, will be chasing this lucrative work.
Finally there are those who would say that government (especially the federal government) should have no place in interfering with something as important as the national infrastrucuture.