American Bridge reported the six-figure gift on its most recent tax forms
New partnership could heighten tensions between Brock, Dem officials
Lawsuit follows deadlocked FEC vote that dismissed complaint alleging federal law violations
Allison Girvin is the new CEO of Shareblue, the 'Breitbart of the left'
Liberal billionaires push money to initiative as Dems ramp up 2020 efforts in region
'Sooner rather than later'
Brock's American Bridge PAC seeks to sway working-class voters in Midwest
Brock's group amps up research as Dems fret Schultz could play spoiler