AUSTIN, Texas (AP) — Harvey's devastation is testing two Texas leaders whose personal styles are as divergent as their politics.

Houston Democratic Mayor Sylvester Turner is a former longtime state lawmaker who made a career of impassioned defenses of liberal legislation that had no hope of passing the GOP-controlled Legislature. Republican Gov. Greg Abbott sets the agenda in his deep red state using a measured, lawyerly demeanor.

The two already have clashed over conflicting instructions on whether to evacuate Houston ahead of Harvey's deadly floods, and there could be more tension coming. It...