The web site https://www.2partyparty.org is a moderately long series of pages. The pages are named well so here is a list of most of the pages. At the bottom of each page are links to the basic topics.
Note: the word manifesto is often considered in a bad light. Try to think of in in the most encompassing sense. Here is a dictionary definition: a public declaration of policy and aims, especially one issued before an election by a political party or candidate
https://www.2partyparty.org/2-parties-are-best-if
https://www.2partyparty.org/1-party-is-not-enough
https://www.2partyparty.org/3rd-parties-create-bad-results
https://www.2partyparty.org/middle-class-manifesto-1
https://www.2partyparty.org/congress-works-for-donors
https://www.2partyparty.org/helping-poor-up-into-middle-class
https://www.2partyparty.org/middle-class-dealing-with-wealthy/a>
https://www.2partyparty.org/methods-1 (and tactics) x
https://www.2partyparty.org/methods-2-interview-committees
https://www.2partyparty.org/methods-4-interview-committees
https://www.2partyparty.org/5-most-divisive-issues
https://www.heatrise.net/pushing-for-congressional-hearings
https://www.heatrise.net/pushing-for-congressional-hearings
https://www.2partyparty.org/2-party-dating-socializing