Mike Johnson, the speaker of the House, got tripped up this weekend by a question that should not have fazed a high-schooler with a moderate degree of civic awareness: Who won the 2020 election?Johnson and other Republicans say the question is a trap. But it’s one they have set for themselves.When George Stephanopoulos asked Johnson on “This Week” to acknowledge that Joe Biden had won the election and Donald Trump lost it, Johnson complained that the ABC anchor was playing “a gotcha game.” He went on, “You want us to litigate things that happened four years ago when we’re talking...