Texas voters are choosing their US Senate nominees in primaries that have become a test of how both parties navigate Donald Trump's second presidency -- and a rehearsal of the internal clashes likely to shape November's midterm elections.

Democrats and Republicans are using the March 3 contests to probe a question that will echo nationwide: do voters reward discipline and incumbency, or do they prefer sharper-edged insurgents who energize their base while carrying greater general-election risk?

Originally published on doc.afp.com, part of the BLOX Digital Content Exchange.