43% Trump38% Clinton
43% Sanders40% Trump
...
51% Cruz34% Clinton
45% Cruz36% Sanders
...
49% Rubio31% Clinton
43% Rubio37% Sanders
...
The Docking Institute of Public Affairs Poll at Fort Hays State University in Kansas of 483 Missourians was conducted March 3-10, and has an overall margin of error of plus or minus 4.6 percentage points. Margin of error among Republican respondents was plus or minus 7 percentage points, among Democrats it was 8 percentage points.
http://www.stltoday.com/news/missouri-poll-results/pdf_403071e8-60bd-5830-ad9e-0364a168dc67.html