Ais someone who seeks to influence public officials in favor of a specific cause or agenda.
libertarian
staffer
lobbyist
reactionary

This is a lobbyist!

A lobbying engages in lobbying, that is the act of attempting to shift someone's (typically the authority or law-makers) opinions towards opinions that would be favourable towards the lobbyist or the people that the lobbyist represents.

Fiscal policy because it refers to the use of government spending and tax policies to influence macroeconomic conditions, including aggregate demand, employment, inflation, and economic growth.