6-10 years of research will be required to scientifically establish the medical benefits of cannabis according to procedures put in place by the DEA.
Federally recognized medical marijuana may be a long way away.
A president in favor of legalization could speed things up. If it's Clinton or Trump, it might be another 6 to 10 years.
At least they both support the rights of states to legalize it. This will be the first election in my lifetime where both of the major candidates support the rights of states to legalize weed.