Prediction markets ramp up DC messaging amid lawmaker pushback 

Prediction markets are making their presence known in Washington with eye-catching advertising and events, as the platforms face growing criticism from lawmakers concerned about insider trading and markets linked to war and death.  Kalshi launched an ad campaign in D.C. last week, with messages displayed in Metro cars, at bus stops and on the sides of buildings to counter the concerns that have plagued the site in recent months.   In bold black lettering on the…