Why is the senate often called “the greatest deliberative body in the world

The main reason why the US Senate is often called “the greatest deliberative body in the world" is because it allows each state to have an equal say in legislation regardless of the state's size, which is a powerful function. 

Republican issue positions have increasingly shaped state government policy.

Explanation:

Based on the given table, the Republican governors have been increasing over the years, while the Democrats have been reducing.

Therefore, the effect or impact of political parties on policy making based on the table is that Republican issue positions have increasingly shaped state government policy