First midterm primaries show incumbents may be on shaky political ground

The first round of primary elections is showing how this year’s midterms will be taking place on shifting political ground for incumbents.

That was particularly true in Texas — the first state to redraw its congressional districts last year — where two incumbent members of Congress have been pushed to a runoff and another has been scuttled from the House altogether.

Democratic Rep. Al Green, an outspoken liberal who has twice been ejected from President Donald Trump’s State of the Union addresses for protesting...