One of the tasks for the left is to reshape the Democratic Party into the kind of political party which can be used to chip away at material disparities of wealth and power. This means making it into a party which can actually pass policies like single payer, tuition free college, $15 minimum wage, stronger union rights, and so on. The thing is, many Democrats in congress don’t support these policies. Some of them admit they don’t support them, while others are pretending to support them but have no intention of following through should they get into power. This is the same position the right found itself in after Obama’s election–they wanted a Republican Party which would repeal Obamacare and take a stand on immigration. But the Republicans they had were either openly uninterested in doing those things or clearly lying about it. So under the banner of the Tea Party these right wingers began working to reshape the Republican Party through the primary mechanism. They made significant gains–the Tea Party helped create senators like Ted Cruz, Marco Rubio, Rand Paul, Jerry Moran, Bill Cassidy, Tim Scott, and Mike Lee. These people are much more right wing than their predecessors 20 or 30 years ago would have been. Over time, their efforts also helped make it possible for an anti-establishment anti-immigration nationalist to win the presidency. But despite all of this the Tea Party has come up short. It was unable to repeal Obamacare because of opposition from John McCain and Lisa Murkowski, two senators it had tried and failed to remove through primaries. It has, to this point, been unable to get its wall built. The Tea Party got a lot done, and it still wasn’t enough. When Trump leaves office, most of what he will have been able to pass will be legislation which George W. Bush could have passed 20 years ago with the Republicans of that period. I’m telling you all of this because, by the looks of it, the left is going to be markedly less successful in these primaries than the Tea Party was two years into the Obama administration, in 2010.