They sure have - see Chris Joseph's comments, the developer of the Pelosi stock tracker app, about having numerous examples from both sides of the aisles of numerous congress members who have traded more and had better returns.
Irrelevant to the matter of scale - Trump's corruption easily exceeds that of Pelosi.
More to the point, this is simple what-about-ism to avoid facing up to corruption in the US government and the poressing need (for many decades now) to take effective action.
As it stands, the emoluments clause and the impeachment wrist slapping make the US a standing joke for poor definition of problem and inability to punish.
Yet it has produced the most fruitful country the world has ever seen. The genius of the document is that it assumes the corruption of a centralized power and provides the proper counter measures to return the power to the people.