So, who is the most conservative Democrat

[MineralMan]

23. Typically, the national Democratic Party organizations do not

get involved in primary races. Attempts to primary incumbent Democrats usually fail and fail miserably. Most Democrats in legislative offices are popular with Democrats in their own district, which makes primary challenges difficult, at best.

Sometimes, people from outside of districts or states don't like some incumbent Democrats, but that rarely affects the incumbents at all. The bottom line is that legislative offices, particularly state and House seats, are truly local elections, and depend almost entirely on local efforts. It's rare for an incumbent, especially one who has served multiple terms to be unseated in a primary election. Normally, they're quite popular in their own district, which is why they have been elected in the first place.

Primary challenges are just fine, and I encourage Democrats to run for whatever office they seek. However, it should be with the knowledge that an incumbent almost always enjoys a huge advantage that is almost impossible to overcome.