People in the same party are not always aligned. Representatives want to get pork for their district, so to get their vote you need to do something for them, e.g. route the high speed train through their district even if that is not the most optimal route.
Agreeing on low-cost housing or high speed rail in the abstract is not enough to form a coalition to implement them.
Agreeing on low-cost housing or high speed rail in the abstract is not enough to form a coalition to implement them.