That’s not this guy’s platform.
Basically, you’re saying that it’s impossible to be a conservative Democrat.
Let’s see what he does if he wins.
As an elected official, it is impossible at the federal level.
Any "conservative democrat" will vote for a democrat to be speaker of the house, or senate majority leader. They will ensure democrats control the committees.
It's been over 30 years since we had a significant actual conservative wing among the dems. These days, people like Stupak are considered "conservative" democrats. I've even heard John Dingell called a conservative democrat over guns, and he was a "LBJ Great Society" guy who supports universal government health care.