I"ve seen the typical republican bot talk when a newbie con drops in here and say, "I used to be a democrat but the party moved too radical..." blah blah blah. Pew kind of cleared that bullshit up.
Both Major Parties are shrinking, independents growing. Looking back to 2006, those who identified themselves as Democrats made up 35% of the electorate, Republicans 30%, independents 30%. Today those numbers are 29% Democrat, 26% Republican, 42% independent. I think the cause is the intransigents and litmus test both major parties throw at folks. One must be ideological pure to belong to either major party.
The problem is in our two-party electoral system, the two major parties have a monopoly on it. There’s nowhere to go if one doesn’t pass either major party’s litmus tests or behave like a mindless robot to the party’s leadership. What’s left is to vote one party in one election, then vote them out the next. We seen this happen in 2006, again in 2010, then in 2018 and if the numbers are a good indication for 2022, it will once again happen. This ideology intransigent is probably a reason we don’t even elect two presidents back to back from the same party. Only once since 1948 have we done that, in 1988 when G.H.W. Bush succeeded Reagan. Otherwise its been democrat, republican, democrat, republican etc.
Perhaps the problem is each major party only governs for their base and not for the whole of America. Perhaps each major party’s agenda is seen as extreme and radical to use your word by those caught in the middle between the two major parties? Neither party will ever come up with an American agenda, so this vote one party in one election and then out the next will continue. The problem is what is mainstream to you may be radical to me and vice versa. This migration of independents voting for one party and then voting for the other and back will continue. The two major parties will also continue to shrink until someday in the near future, independents will make up the majority of the electorate. But nothing will change, not until the two party monopoly of our electoral system is finally broken.