In this Jan. 17, 1972 file photo, Sen. George McGovern, D-S.D., joins in a three way handshake with Salvador Luria, left, a Nobel Laureate in biology from Massachusetts Institute of Technology, and physicist Harry Palevsky of the Brookhaven National Laboratory of Long Island, N.Y., after they announced their support for his presidential campaign at a news conference in Boston.  A family spokesman says, McGovern, the Democrat who lost to President Richard Nixon in 1972 in a historic landslide, has died at the age of 90. (AP Photo/Bill Chaplis, File)

Photo by: Bill Chaplis

In this Jan. 17, 1972 file photo, Sen. George McGovern, D-S.D., joins in a three way handshake with Salvador Luria, left, a Nobel Laureate in biology from Massachusetts Institute of Technology, and physicist Harry Palevsky of the Brookhaven National Laboratory of Long Island, N.Y., after they announced their support for his presidential campaign at a news conference in Boston. A family spokesman says, McGovern, the Democrat who lost to President Richard Nixon in 1972 in a historic landslide, has died at the age of 90. (AP Photo/Bill Chaplis, File)