Audio receipts of Dem leaders standing up for American workers against illegal aliens - what changed?

Heading deep into the audio archives, Ryan unearths telling clips of Democrat party leaders and office holders standing fast against illegal aliens undermining the wages of American workers - Presidents Bill Clinton, Barack Obama, and Joe Biden, long-time House Speaker Nancy Pelosi (D-CA), long-time Senate majority/minority leader Chuck Schumer (D-NY), Secretary of State Hillary Clinton (D-NY), current Senator Amy Klobuchar (D-MN) - all singing out of the same hymnal until somthing changed.

What caused them to abandon the working class on behalf of migrants earning cut wages from meat-packaging plants, landscaping services, agricultural cultivation, and other areas of labor?