At least $20 million was spent on lobbying during this past legislative session, not counting money spent in the lead-up to the General Assembly’s January start date or spending unreported in a state database. It represents a snapshot of how industry and interest groups try to sway lawmakers into supporting, altering or killing some of the hundreds of measures considered by the legislature every year. The Denver Post analyzed records posted on the Secretary of State’s website for January through May, though the report included some early filings for the first weeks of June.