1) All political parties should be banned - if not outright banned than at the least be given no official recognition at all and party affiliation should not be on the ballot for certain. If you want to seize control of the government from rich and from huge corporations and PAC's then get rid of political parties that owe huge favors to them - no matter how rich you can not buy an election every election cycle. By losing political party backing and support there would be no more automatic re-elects based on districts - what we call a democrat in a primarily urban minority area or a republican in a upper middle class conservative district would no longer run unopposed. Every elected official would have to actually compete in the primary and the general election. The 2 highest vote getters in the primary should be the 2 candidates in the general election- if that meant in the last presidential election Hillary Clinton and Obama were facing off in the general election then that is far preferable than this person against that person based on separate party affiliation. This would have the effect of enacting term limits because if politicians were not doing there job they would face actual competition in both the primary and general election to hold them accountable for their actions. Congress would vote with common sense rather than out of fear of being cut off from party funding in the next election. It makes far less sense for a special interest to put huge resources into getting a person elected if it is not a sure thing for them to stay in power long term. It would also eliminate party ticket voting and simply choosing republican or democrat based on what the AARP or the NRA told you to do or what you "have always done" - God forbid a citizen had to actually watch news and read newspapers and follow debates and issues to decide instead of following like sheep based on the letter beside the candidates name.
2) Multi party systems are even worse - their are multitudes of countries with long standing true multi party systems - it produces nothing but inaction and deadlock - as hard as it is to get anything accomplished with 2 parties imagine trying to get a majority of 51% with 5 antagonistic groups. It simply does not work efficiently in any way and leads to even more shady back door deals and pork barrel politics.
Pure opinion of course.