NEW YORK - Patti Davis, daughter of the late President Ronald Reagan (news - web sites), has filed a lawsuit charging that the Salvation Army canceled her speech planned for one of their events because she supports stem cell research. Davis was scheduled through her booking agent, Greater Talent Network, to speak at a Salvation Army event in Santa Rosa, Calif., on Nov. 19 for a fee of $15,000, said her lawyer, Lawrence Fabian.