Since Senator Grassley launched an investigation of not-for-profit hospitals, a political action committee funded by the hospital's trustees and executives has given tens of thousands of dollars in campaign contributions to try to regain a Democratic majority in the Senate, which would have the effect of ousting Mr. Grassley from his post as chairman of the Senate Finance Committee. The hospital claims that the political action committee is independent of it. "The PAC is independent of NewYork-Presbyterian Hospital. I have no information about it and would not be the one to provide information," a spokeswoman for the hospital, Kathleen Robinson,...