The Democrats, including President Obama, have embarked on a disastrous campaign impugning the US Chamber of Commerce as a source of nefarious foreign money corrupting our campaigns. Not only has the accusation failed to resonate, it has opened a door that Democrats would prefer remain closed. And because Washington Post writer Marc A. Thiessen has taken up the question, it will be impossible to contain the very valid questions raised: ...one of the largest labor unions in America, the Service Employees International Union (SEIU), ... is spending lavishly to elect Democrats. The SEIU claims 100,000 members in Canada. According to...