Texas Rep. Dan Crenshaw owes his defeat in this week's Republican primary to a billionaire megadonor who was hellbent on ending Crenshaw's career, sources tell Axios.Why it matters: Texas banker Robert Marling's role in funding an anti-Crenshaw advertising blitz starkly illustrates how a lone billionaire can banish a member of Congress.In this case, Marling's clout meant Crenshaw was the first House incumbent to be ousted in 2026. Crenshaw lost to Texas state Rep. Steve Toth, a hard-line conserv...