Lawmakers will return to Springfield Monday nearly five months after a momentous spring legislative session that saw the passage of massive bills from recreational marijuana legalization to a $45 billion infrastructure plan. 

But the political climate has shifted significantly since early June, since the existence of  widespread federal corruption probes was revealed over the summer and fall. The inquires appear targeted at Democrats and their allies, but the investigations have also shaken Republicans and longtime Springfield lobbyists who work for bipartisan interests across industries.