If Democrats Push for Full Marijuana Legalization, Republicans Would Never Win Again

I'm not sold on this theory, but the narrative goes:

Here's the rationale. Marijuana legalization would:

1. Increase voter turnout among young people

2. Lead many Libertarians to vote for Democrats

3. Lead many Independents to vote for Democrats

4. Increase voter turnout overall

(Republicans win when voter turnout is low. Republicans also get advantages from many people who classify themselves as "Libertarians", but in reality only want marijuana to be legal)

I think most Libertarians would (should) NEVER vote Democrat because they are the party of big spending and big government with no limits. After Bernie Sanders' success, they might just become the Socialist party.

What do you think?