By Jan Wolfe WASHINGTON (Reuters) -The first criminal trial of a person accused of taking part in the Jan. 6, 2021, assault on the U.S. Capitol by Donald Trump’s supporters opened on Monday, with a judge screening potential jurors for bias. The defendant, Guy Reffitt of Texas, is one of about 750 people charged with taking part in the riot, which attempted to stop Congress from formally certifying Democratic President Joe Biden’s election. A guilty verdict for Reffitt could motivate other defendants who face felony charges to accept plea deals offered by prosecutors. More than 200 people have …