By Elise Viebeck - 09/11/12 01:30 PM EDT
"Go ObamaCare," the president signs on med student's lab coat.
Romney, Ryan camps walking back statements on the healthcare reform law.
Mitt Romney struggles with "replace" in healthcare law if he wins the White House.
Study: Marijuana smoking tied to testicular cancer.
Vote: Are doctors overprescribing ADHD meds?