Perhaps you believe that's natural since they are progressives who butt heads with the party and cause them grief. There's a price to be paid for independence. But if that's true, it's only if you are a progressive legislator. If you are someone who votes with the Republicans most of the time and publicly disdains the leadership, they will reward you with cash and support:
Here's the latest ad from Bobby Bright, one of those incumbents favored with generous support from the party: And this one's just awesome:
The Democrats have candidates in trouble all over the country. Grayson and Grijalva are just two of any number of incumbents who are in races that are going to be nail biters on election night. And yet the Party is standing behind people who are basically running against them and undermining everything the Democratic party allegedly stands for while ignoring those who are taking their fight to the Republicans.